// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

// This is CodeMirror (https://codemirror.net), a code editor
// implemented in JavaScript on top of the browser's DOM.
//
// You can find some technical background for some of the code below
// at http://marijnhaverbeke.nl/blog/#cm-internals .

(function (global, factory) {
  typeof exports === "object" && typeof module !== "undefined"
    ? (module.exports = factory())
    : typeof define === "function" && define.amd
    ? define(factory)
    : ((global = global || self), (global.CodeMirror = factory()));
})(this, function () {
  "use strict";

  // Kludges for bugs and behavior differences that can't be feature
  // detected are enabled based on userAgent etc sniffing.
  var userAgent = navigator.userAgent;
  var platform = navigator.platform;

  var gecko = /gecko\/\d/i.test(userAgent);
  var ie_upto10 = /MSIE \d/.test(userAgent);
  var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
  var edge = /Edge\/(\d+)/.exec(userAgent);
  var ie = ie_upto10 || ie_11up || edge;
  var ie_version =
    ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);
  var webkit = !edge && /WebKit\//.test(userAgent);
  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
  var chrome = !edge && /Chrome\//.test(userAgent);
  var presto = /Opera\//.test(userAgent);
  var safari = /Apple Computer/.test(navigator.vendor);
  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
  var phantom = /PhantomJS/.test(userAgent);

  var ios =
    safari && (/Mobile\/\w+/.test(userAgent) || navigator.maxTouchPoints > 2);
  var android = /Android/.test(userAgent);
  // This is woefully incomplete. Suggestions for alternative methods welcome.
  var mobile =
    ios ||
    android ||
    /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
  var mac = ios || /Mac/.test(platform);
  var chromeOS = /\bCrOS\b/.test(userAgent);
  var windows = /win/i.test(platform);

  var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
  if (presto_version) {
    presto_version = Number(presto_version[1]);
  }
  if (presto_version && presto_version >= 15) {
    presto = false;
    webkit = true;
  }
  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
  var flipCtrlCmd =
    mac &&
    (qtwebkit ||
      (presto && (presto_version == null || presto_version < 12.11)));
  var captureRightClick = gecko || (ie && ie_version >= 9);

  function classTest(cls) {
    return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*");
  }

  var rmClass = function (node, cls) {
    var current = node.className;
    var match = classTest(cls).exec(current);
    if (match) {
      var after = current.slice(match.index + match[0].length);
      node.className =
        current.slice(0, match.index) + (after ? match[1] + after : "");
    }
  };

  function removeChildren(e) {
    for (var count = e.childNodes.length; count > 0; --count) {
      e.removeChild(e.firstChild);
    }
    return e;
  }

  function removeChildrenAndAdd(parent, e) {
    return removeChildren(parent).appendChild(e);
  }

  function elt(tag, content, className, style) {
    var e = document.createElement(tag);
    if (className) {
      e.className = className;
    }
    if (style) {
      e.style.cssText = style;
    }
    if (typeof content == "string") {
      e.appendChild(document.createTextNode(content));
    } else if (content) {
      for (var i = 0; i < content.length; ++i) {
        e.appendChild(content[i]);
      }
    }
    return e;
  }
  // wrapper for elt, which removes the elt from the accessibility tree
  function eltP(tag, content, className, style) {
    var e = elt(tag, content, className, style);
    e.setAttribute("role", "presentation");
    return e;
  }

  var range;
  if (document.createRange) {
    range = function (node, start, end, endNode) {
      var r = document.createRange();
      r.setEnd(endNode || node, end);
      r.setStart(node, start);
      return r;
    };
  } else {
    range = function (node, start, end) {
      var r = document.body.createTextRange();
      try {
        r.moveToElementText(node.parentNode);
      } catch (e) {
        return r;
      }
      r.collapse(true);
      r.moveEnd("character", end);
      r.moveStart("character", start);
      return r;
    };
  }

  function contains(parent, child) {
    if (child.nodeType == 3) {
      // Android browser always returns false when child is a textnode
      child = child.parentNode;
    }
    if (parent.contains) {
      return parent.contains(child);
    }
    do {
      if (child.nodeType == 11) {
        child = child.host;
      }
      if (child == parent) {
        return true;
      }
    } while ((child = child.parentNode));
  }

  function activeElt() {
    // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
    // IE < 10 will throw when accessed while the page is loading or in an iframe.
    // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
    var activeElement;
    try {
      activeElement = document.activeElement;
    } catch (e) {
      activeElement = document.body || null;
    }
    while (
      activeElement &&
      activeElement.shadowRoot &&
      activeElement.shadowRoot.activeElement
    ) {
      activeElement = activeElement.shadowRoot.activeElement;
    }
    return activeElement;
  }

  function addClass(node, cls) {
    var current = node.className;
    if (!classTest(cls).test(current)) {
      node.className += (current ? " " : "") + cls;
    }
  }
  function joinClasses(a, b) {
    var as = a.split(" ");
    for (var i = 0; i < as.length; i++) {
      if (as[i] && !classTest(as[i]).test(b)) {
        b += " " + as[i];
      }
    }
    return b;
  }

  var selectInput = function (node) {
    node.select();
  };
  if (ios) {
    // Mobile Safari apparently has a bug where select() is broken.
    selectInput = function (node) {
      node.selectionStart = 0;
      node.selectionEnd = node.value.length;
    };
  } else if (ie) {
    // Suppress mysterious IE10 errors
    selectInput = function (node) {
      try {
        node.select();
      } catch (_e) {}
    };
  }

  function bind(f) {
    var args = Array.prototype.slice.call(arguments, 1);
    return function () {
      return f.apply(null, args);
    };
  }

  function copyObj(obj, target, overwrite) {
    if (!target) {
      target = {};
    }
    for (var prop in obj) {
      if (
        obj.hasOwnProperty(prop) &&
        (overwrite !== false || !target.hasOwnProperty(prop))
      ) {
        target[prop] = obj[prop];
      }
    }
    return target;
  }

  // Counts the column offset in a string, taking tabs into account.
  // Used mostly to find indentation.
  function countColumn(string, end, tabSize, startIndex, startValue) {
    if (end == null) {
      end = string.search(/[^\s\u00a0]/);
      if (end == -1) {
        end = string.length;
      }
    }
    for (var i = startIndex || 0, n = startValue || 0; ; ) {
      var nextTab = string.indexOf("\t", i);
      if (nextTab < 0 || nextTab >= end) {
        return n + (end - i);
      }
      n += nextTab - i;
      n += tabSize - (n % tabSize);
      i = nextTab + 1;
    }
  }

  var Delayed = function () {
    this.id = null;
    this.f = null;
    this.time = 0;
    this.handler = bind(this.onTimeout, this);
  };
  Delayed.prototype.onTimeout = function (self) {
    self.id = 0;
    if (self.time <= +new Date()) {
      self.f();
    } else {
      setTimeout(self.handler, self.time - +new Date());
    }
  };
  Delayed.prototype.set = function (ms, f) {
    this.f = f;
    var time = +new Date() + ms;
    if (!this.id || time < this.time) {
      clearTimeout(this.id);
      this.id = setTimeout(this.handler, ms);
      this.time = time;
    }
  };

  function indexOf(array, elt) {
    for (var i = 0; i < array.length; ++i) {
      if (array[i] == elt) {
        return i;
      }
    }
    return -1;
  }

  // Number of pixels added to scroller and sizer to hide scrollbar
  var scrollerGap = 50;

  // Returned or thrown by various protocols to signal 'I'm not
  // handling this'.
  var Pass = {
    toString: function () {
      return "CodeMirror.Pass";
    },
  };

  // Reused option objects for setSelection & friends
  var sel_dontScroll = { scroll: false },
    sel_mouse = { origin: "*mouse" },
    sel_move = { origin: "+move" };

  // The inverse of countColumn -- find the offset that corresponds to
  // a particular column.
  function findColumn(string, goal, tabSize) {
    for (var pos = 0, col = 0; ; ) {
      var nextTab = string.indexOf("\t", pos);
      if (nextTab == -1) {
        nextTab = string.length;
      }
      var skipped = nextTab - pos;
      if (nextTab == string.length || col + skipped >= goal) {
        return pos + Math.min(skipped, goal - col);
      }
      col += nextTab - pos;
      col += tabSize - (col % tabSize);
      pos = nextTab + 1;
      if (col >= goal) {
        return pos;
      }
    }
  }

  var spaceStrs = [""];
  function spaceStr(n) {
    while (spaceStrs.length <= n) {
      spaceStrs.push(lst(spaceStrs) + " ");
    }
    return spaceStrs[n];
  }

  function lst(arr) {
    return arr[arr.length - 1];
  }

  function map(array, f) {
    var out = [];
    for (var i = 0; i < array.length; i++) {
      out[i] = f(array[i], i);
    }
    return out;
  }

  function insertSorted(array, value, score) {
    var pos = 0,
      priority = score(value);
    while (pos < array.length && score(array[pos]) <= priority) {
      pos++;
    }
    array.splice(pos, 0, value);
  }

  function nothing() {}

  function createObj(base, props) {
    var inst;
    if (Object.create) {
      inst = Object.create(base);
    } else {
      nothing.prototype = base;
      inst = new nothing();
    }
    if (props) {
      copyObj(props, inst);
    }
    return inst;
  }

  var nonASCIISingleCaseWordChar =
    /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
  function isWordCharBasic(ch) {
    return (
      /\w/.test(ch) ||
      (ch > "\x80" &&
        (ch.toUpperCase() != ch.toLowerCase() ||
          nonASCIISingleCaseWordChar.test(ch)))
    );
  }
  function isWordChar(ch, helper) {
    if (!helper) {
      return isWordCharBasic(ch);
    }
    if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) {
      return true;
    }
    return helper.test(ch);
  }

  function isEmpty(obj) {
    for (var n in obj) {
      if (obj.hasOwnProperty(n) && obj[n]) {
        return false;
      }
    }
    return true;
  }

  // Extending unicode characters. A series of a non-extending char +
  // any number of extending chars is treated as a single unit as far
  // as editing and measuring is concerned. This is not fully correct,
  // since some scripts/fonts/browsers also treat other configurations
  // of code points as a group.
  var extendingChars =
    /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
  function isExtendingChar(ch) {
    return ch.charCodeAt(0) >= 768 && extendingChars.test(ch);
  }

  // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
  function skipExtendingChars(str, pos, dir) {
    while (
      (dir < 0 ? pos > 0 : pos < str.length) &&
      isExtendingChar(str.charAt(pos))
    ) {
      pos += dir;
    }
    return pos;
  }

  // Returns the value from the range [`from`; `to`] that satisfies
  // `pred` and is closest to `from`. Assumes that at least `to`
  // satisfies `pred`. Supports `from` being greater than `to`.
  function findFirst(pred, from, to) {
    // At any point we are certain `to` satisfies `pred`, don't know
    // whether `from` does.
    var dir = from > to ? -1 : 1;
    for (;;) {
      if (from == to) {
        return from;
      }
      var midF = (from + to) / 2,
        mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);
      if (mid == from) {
        return pred(mid) ? from : to;
      }
      if (pred(mid)) {
        to = mid;
      } else {
        from = mid + dir;
      }
    }
  }

  // BIDI HELPERS

  function iterateBidiSections(order, from, to, f) {
    if (!order) {
      return f(from, to, "ltr", 0);
    }
    var found = false;
    for (var i = 0; i < order.length; ++i) {
      var part = order[i];
      if (
        (part.from < to && part.to > from) ||
        (from == to && part.to == from)
      ) {
        f(
          Math.max(part.from, from),
          Math.min(part.to, to),
          part.level == 1 ? "rtl" : "ltr",
          i
        );
        found = true;
      }
    }
    if (!found) {
      f(from, to, "ltr");
    }
  }

  var bidiOther = null;
  function getBidiPartAt(order, ch, sticky) {
    var found;
    bidiOther = null;
    for (var i = 0; i < order.length; ++i) {
      var cur = order[i];
      if (cur.from < ch && cur.to > ch) {
        return i;
      }
      if (cur.to == ch) {
        if (cur.from != cur.to && sticky == "before") {
          found = i;
        } else {
          bidiOther = i;
        }
      }
      if (cur.from == ch) {
        if (cur.from != cur.to && sticky != "before") {
          found = i;
        } else {
          bidiOther = i;
        }
      }
    }
    return found != null ? found : bidiOther;
  }

  // Bidirectional ordering algorithm
  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
  // that this (partially) implements.

  // One-char codes used for character types:
  // L (L):   Left-to-Right
  // R (R):   Right-to-Left
  // r (AL):  Right-to-Left Arabic
  // 1 (EN):  European Number
  // + (ES):  European Number Separator
  // % (ET):  European Number Terminator
  // n (AN):  Arabic Number
  // , (CS):  Common Number Separator
  // m (NSM): Non-Spacing Mark
  // b (BN):  Boundary Neutral
  // s (B):   Paragraph Separator
  // t (S):   Segment Separator
  // w (WS):  Whitespace
  // N (ON):  Other Neutrals

  // Returns null if characters are ordered as they appear
  // (left-to-right), or an array of sections ({from, to, level}
  // objects) in the order in which they occur visually.
  var bidiOrdering = (function () {
    // Character types for codepoints 0 to 0xff
    var lowTypes =
      "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
    // Character types for codepoints 0x600 to 0x6f9
    var arabicTypes =
      "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111";
    function charType(code) {
      if (code <= 0xf7) {
        return lowTypes.charAt(code);
      } else if (0x590 <= code && code <= 0x5f4) {
        return "R";
      } else if (0x600 <= code && code <= 0x6f9) {
        return arabicTypes.charAt(code - 0x600);
      } else if (0x6ee <= code && code <= 0x8ac) {
        return "r";
      } else if (0x2000 <= code && code <= 0x200b) {
        return "w";
      } else if (code == 0x200c) {
        return "b";
      } else {
        return "L";
      }
    }

    var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
    var isNeutral = /[stwN]/,
      isStrong = /[LRr]/,
      countsAsLeft = /[Lb1n]/,
      countsAsNum = /[1n]/;

    function BidiSpan(level, from, to) {
      this.level = level;
      this.from = from;
      this.to = to;
    }

    return function (str, direction) {
      var outerType = direction == "ltr" ? "L" : "R";

      if (str.length == 0 || (direction == "ltr" && !bidiRE.test(str))) {
        return false;
      }
      var len = str.length,
        types = [];
      for (var i = 0; i < len; ++i) {
        types.push(charType(str.charCodeAt(i)));
      }

      // W1. Examine each non-spacing mark (NSM) in the level run, and
      // change the type of the NSM to the type of the previous
      // character. If the NSM is at the start of the level run, it will
      // get the type of sor.
      for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
        var type = types[i$1];
        if (type == "m") {
          types[i$1] = prev;
        } else {
          prev = type;
        }
      }

      // W2. Search backwards from each instance of a European number
      // until the first strong type (R, L, AL, or sor) is found. If an
      // AL is found, change the type of the European number to Arabic
      // number.
      // W3. Change all ALs to R.
      for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
        var type$1 = types[i$2];
        if (type$1 == "1" && cur == "r") {
          types[i$2] = "n";
        } else if (isStrong.test(type$1)) {
          cur = type$1;
          if (type$1 == "r") {
            types[i$2] = "R";
          }
        }
      }

      // W4. A single European separator between two European numbers
      // changes to a European number. A single common separator between
      // two numbers of the same type changes to that type.
      for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
        var type$2 = types[i$3];
        if (type$2 == "+" && prev$1 == "1" && types[i$3 + 1] == "1") {
          types[i$3] = "1";
        } else if (
          type$2 == "," &&
          prev$1 == types[i$3 + 1] &&
          (prev$1 == "1" || prev$1 == "n")
        ) {
          types[i$3] = prev$1;
        }
        prev$1 = type$2;
      }

      // W5. A sequence of European terminators adjacent to European
      // numbers changes to all European numbers.
      // W6. Otherwise, separators and terminators change to Other
      // Neutral.
      for (var i$4 = 0; i$4 < len; ++i$4) {
        var type$3 = types[i$4];
        if (type$3 == ",") {
          types[i$4] = "N";
        } else if (type$3 == "%") {
          var end = void 0;
          for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}
          var replace =
            (i$4 && types[i$4 - 1] == "!") || (end < len && types[end] == "1")
              ? "1"
              : "N";
          for (var j = i$4; j < end; ++j) {
            types[j] = replace;
          }
          i$4 = end - 1;
        }
      }

      // W7. Search backwards from each instance of a European number
      // until the first strong type (R, L, or sor) is found. If an L is
      // found, then change the type of the European number to L.
      for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
        var type$4 = types[i$5];
        if (cur$1 == "L" && type$4 == "1") {
          types[i$5] = "L";
        } else if (isStrong.test(type$4)) {
          cur$1 = type$4;
        }
      }

      // N1. A sequence of neutrals takes the direction of the
      // surrounding strong text if the text on both sides has the same
      // direction. European and Arabic numbers act as if they were R in
      // terms of their influence on neutrals. Start-of-level-run (sor)
      // and end-of-level-run (eor) are used at level run boundaries.
      // N2. Any remaining neutrals take the embedding direction.
      for (var i$6 = 0; i$6 < len; ++i$6) {
        if (isNeutral.test(types[i$6])) {
          var end$1 = void 0;
          for (
            end$1 = i$6 + 1;
            end$1 < len && isNeutral.test(types[end$1]);
            ++end$1
          ) {}
          var before = (i$6 ? types[i$6 - 1] : outerType) == "L";
          var after = (end$1 < len ? types[end$1] : outerType) == "L";
          var replace$1 = before == after ? (before ? "L" : "R") : outerType;
          for (var j$1 = i$6; j$1 < end$1; ++j$1) {
            types[j$1] = replace$1;
          }
          i$6 = end$1 - 1;
        }
      }

      // Here we depart from the documented algorithm, in order to avoid
      // building up an actual levels array. Since there are only three
      // levels (0, 1, 2) in an implementation that doesn't take
      // explicit embedding into account, we can build up the order on
      // the fly, without following the level-based algorithm.
      var order = [],
        m;
      for (var i$7 = 0; i$7 < len; ) {
        if (countsAsLeft.test(types[i$7])) {
          var start = i$7;
          for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}
          order.push(new BidiSpan(0, start, i$7));
        } else {
          var pos = i$7,
            at = order.length,
            isRTL = direction == "rtl" ? 1 : 0;
          for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}
          for (var j$2 = pos; j$2 < i$7; ) {
            if (countsAsNum.test(types[j$2])) {
              if (pos < j$2) {
                order.splice(at, 0, new BidiSpan(1, pos, j$2));
                at += isRTL;
              }
              var nstart = j$2;
              for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}
              order.splice(at, 0, new BidiSpan(2, nstart, j$2));
              at += isRTL;
              pos = j$2;
            } else {
              ++j$2;
            }
          }
          if (pos < i$7) {
            order.splice(at, 0, new BidiSpan(1, pos, i$7));
          }
        }
      }
      if (direction == "ltr") {
        if (order[0].level == 1 && (m = str.match(/^\s+/))) {
          order[0].from = m[0].length;
          order.unshift(new BidiSpan(0, 0, m[0].length));
        }
        if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
          lst(order).to -= m[0].length;
          order.push(new BidiSpan(0, len - m[0].length, len));
        }
      }

      return direction == "rtl" ? order.reverse() : order;
    };
  })();

  // Get the bidi ordering for the given line (and cache it). Returns
  // false for lines that are fully left-to-right, and an array of
  // BidiSpan objects otherwise.
  function getOrder(line, direction) {
    var order = line.order;
    if (order == null) {
      order = line.order = bidiOrdering(line.text, direction);
    }
    return order;
  }

  // EVENT HANDLING

  // Lightweight event framework. on/off also work on DOM nodes,
  // registering native DOM handlers.

  var noHandlers = [];

  var on = function (emitter, type, f) {
    if (emitter.addEventListener) {
      emitter.addEventListener(type, f, false);
    } else if (emitter.attachEvent) {
      emitter.attachEvent("on" + type, f);
    } else {
      var map = emitter._handlers || (emitter._handlers = {});
      map[type] = (map[type] || noHandlers).concat(f);
    }
  };

  function getHandlers(emitter, type) {
    return (emitter._handlers && emitter._handlers[type]) || noHandlers;
  }

  function off(emitter, type, f) {
    if (emitter.removeEventListener) {
      emitter.removeEventListener(type, f, false);
    } else if (emitter.detachEvent) {
      emitter.detachEvent("on" + type, f);
    } else {
      var map = emitter._handlers,
        arr = map && map[type];
      if (arr) {
        var index = indexOf(arr, f);
        if (index > -1) {
          map[type] = arr.slice(0, index).concat(arr.slice(index + 1));
        }
      }
    }
  }

  function signal(emitter, type /*, values...*/) {
    var handlers = getHandlers(emitter, type);
    if (!handlers.length) {
      return;
    }
    var args = Array.prototype.slice.call(arguments, 2);
    for (var i = 0; i < handlers.length; ++i) {
      handlers[i].apply(null, args);
    }
  }

  // The DOM events that CodeMirror handles can be overridden by
  // registering a (non-DOM) handler on the editor for the event name,
  // and preventDefault-ing the event in that handler.
  function signalDOMEvent(cm, e, override) {
    if (typeof e == "string") {
      e = {
        type: e,
        preventDefault: function () {
          this.defaultPrevented = true;
        },
      };
    }
    signal(cm, override || e.type, cm, e);
    return e_defaultPrevented(e) || e.codemirrorIgnore;
  }

  function signalCursorActivity(cm) {
    var arr = cm._handlers && cm._handlers.cursorActivity;
    if (!arr) {
      return;
    }
    var set =
      cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
    for (var i = 0; i < arr.length; ++i) {
      if (indexOf(set, arr[i]) == -1) {
        set.push(arr[i]);
      }
    }
  }

  function hasHandler(emitter, type) {
    return getHandlers(emitter, type).length > 0;
  }

  // Add on and off methods to a constructor's prototype, to make
  // registering events on such objects more convenient.
  function eventMixin(ctor) {
    ctor.prototype.on = function (type, f) {
      on(this, type, f);
    };
    ctor.prototype.off = function (type, f) {
      off(this, type, f);
    };
  }

  // Due to the fact that we still support jurassic IE versions, some
  // compatibility wrappers are needed.

  function e_preventDefault(e) {
    if (e.preventDefault) {
      e.preventDefault();
    } else {
      e.returnValue = false;
    }
  }
  function e_stopPropagation(e) {
    if (e.stopPropagation) {
      e.stopPropagation();
    } else {
      e.cancelBubble = true;
    }
  }
  function e_defaultPrevented(e) {
    return e.defaultPrevented != null
      ? e.defaultPrevented
      : e.returnValue == false;
  }
  function e_stop(e) {
    e_preventDefault(e);
    e_stopPropagation(e);
  }

  function e_target(e) {
    return e.target || e.srcElement;
  }
  function e_button(e) {
    var b = e.which;
    if (b == null) {
      if (e.button & 1) {
        b = 1;
      } else if (e.button & 2) {
        b = 3;
      } else if (e.button & 4) {
        b = 2;
      }
    }
    if (mac && e.ctrlKey && b == 1) {
      b = 3;
    }
    return b;
  }

  // Detect drag-and-drop
  var dragAndDrop = (function () {
    // There is *some* kind of drag-and-drop support in IE6-8, but I
    // couldn't get it to work yet.
    if (ie && ie_version < 9) {
      return false;
    }
    var div = elt("div");
    return "draggable" in div || "dragDrop" in div;
  })();

  var zwspSupported;
  function zeroWidthElement(measure) {
    if (zwspSupported == null) {
      var test = elt("span", "\u200b");
      removeChildrenAndAdd(
        measure,
        elt("span", [test, document.createTextNode("x")])
      );
      if (measure.firstChild.offsetHeight != 0) {
        zwspSupported =
          test.offsetWidth <= 1 &&
          test.offsetHeight > 2 &&
          !(ie && ie_version < 8);
      }
    }
    var node = zwspSupported
      ? elt("span", "\u200b")
      : elt(
          "span",
          "\u00a0",
          null,
          "display: inline-block; width: 1px; margin-right: -1px"
        );
    node.setAttribute("cm-text", "");
    return node;
  }

  // Feature-detect IE's crummy client rect reporting for bidi text
  var badBidiRects;
  function hasBadBidiRects(measure) {
    if (badBidiRects != null) {
      return badBidiRects;
    }
    var txt = removeChildrenAndAdd(
      measure,
      document.createTextNode("A\u062eA")
    );
    var r0 = range(txt, 0, 1).getBoundingClientRect();
    var r1 = range(txt, 1, 2).getBoundingClientRect();
    removeChildren(measure);
    if (!r0 || r0.left == r0.right) {
      return false;
    } // Safari returns null in some cases (#2780)
    return (badBidiRects = r1.right - r0.right < 3);
  }

  // See if "".split is the broken IE version, if so, provide an
  // alternative way to split lines.
  var splitLinesAuto =
    "\n\nb".split(/\n/).length != 3
      ? function (string) {
          var pos = 0,
            result = [],
            l = string.length;
          while (pos <= l) {
            var nl = string.indexOf("\n", pos);
            if (nl == -1) {
              nl = string.length;
            }
            var line = string.slice(
              pos,
              string.charAt(nl - 1) == "\r" ? nl - 1 : nl
            );
            var rt = line.indexOf("\r");
            if (rt != -1) {
              result.push(line.slice(0, rt));
              pos += rt + 1;
            } else {
              result.push(line);
              pos = nl + 1;
            }
          }
          return result;
        }
      : function (string) {
          return string.split(/\r\n?|\n/);
        };

  var hasSelection = window.getSelection
    ? function (te) {
        try {
          return te.selectionStart != te.selectionEnd;
        } catch (e) {
          return false;
        }
      }
    : function (te) {
        var range;
        try {
          range = te.ownerDocument.selection.createRange();
        } catch (e) {}
        if (!range || range.parentElement() != te) {
          return false;
        }
        return range.compareEndPoints("StartToEnd", range) != 0;
      };

  var hasCopyEvent = (function () {
    var e = elt("div");
    if ("oncopy" in e) {
      return true;
    }
    e.setAttribute("oncopy", "return;");
    return typeof e.oncopy == "function";
  })();

  var badZoomedRects = null;
  function hasBadZoomedRects(measure) {
    if (badZoomedRects != null) {
      return badZoomedRects;
    }
    var node = removeChildrenAndAdd(measure, elt("span", "x"));
    var normal = node.getBoundingClientRect();
    var fromRange = range(node, 0, 1).getBoundingClientRect();
    return (badZoomedRects = Math.abs(normal.left - fromRange.left) > 1);
  }

  // Known modes, by name and by MIME
  var modes = {},
    mimeModes = {};

  // Extra arguments are stored as the mode's dependencies, which is
  // used by (legacy) mechanisms like loadmode.js to automatically
  // load a mode. (Preferred mechanism is the require/define calls.)
  function defineMode(name, mode) {
    if (arguments.length > 2) {
      mode.dependencies = Array.prototype.slice.call(arguments, 2);
    }
    modes[name] = mode;
  }

  function defineMIME(mime, spec) {
    mimeModes[mime] = spec;
  }

  // Given a MIME type, a {name, ...options} config object, or a name
  // string, return a mode config object.
  function resolveMode(spec) {
    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
      spec = mimeModes[spec];
    } else if (
      spec &&
      typeof spec.name == "string" &&
      mimeModes.hasOwnProperty(spec.name)
    ) {
      var found = mimeModes[spec.name];
      if (typeof found == "string") {
        found = { name: found };
      }
      spec = createObj(found, spec);
      spec.name = found.name;
    } else if (
      typeof spec == "string" &&
      /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)
    ) {
      return resolveMode("application/xml");
    } else if (
      typeof spec == "string" &&
      /^[\w\-]+\/[\w\-]+\+json$/.test(spec)
    ) {
      return resolveMode("application/json");
    }
    if (typeof spec == "string") {
      return { name: spec };
    } else {
      return spec || { name: "null" };
    }
  }

  // Given a mode spec (anything that resolveMode accepts), find and
  // initialize an actual mode object.
  function getMode(options, spec) {
    spec = resolveMode(spec);
    var mfactory = modes[spec.name];
    if (!mfactory) {
      return getMode(options, "text/plain");
    }
    var modeObj = mfactory(options, spec);
    if (modeExtensions.hasOwnProperty(spec.name)) {
      var exts = modeExtensions[spec.name];
      for (var prop in exts) {
        if (!exts.hasOwnProperty(prop)) {
          continue;
        }
        if (modeObj.hasOwnProperty(prop)) {
          modeObj["_" + prop] = modeObj[prop];
        }
        modeObj[prop] = exts[prop];
      }
    }
    modeObj.name = spec.name;
    if (spec.helperType) {
      modeObj.helperType = spec.helperType;
    }
    if (spec.modeProps) {
      for (var prop$1 in spec.modeProps) {
        modeObj[prop$1] = spec.modeProps[prop$1];
      }
    }

    return modeObj;
  }

  // This can be used to attach properties to mode objects from
  // outside the actual mode definition.
  var modeExtensions = {};
  function extendMode(mode, properties) {
    var exts = modeExtensions.hasOwnProperty(mode)
      ? modeExtensions[mode]
      : (modeExtensions[mode] = {});
    copyObj(properties, exts);
  }

  function copyState(mode, state) {
    if (state === true) {
      return state;
    }
    if (mode.copyState) {
      return mode.copyState(state);
    }
    var nstate = {};
    for (var n in state) {
      var val = state[n];
      if (val instanceof Array) {
        val = val.concat([]);
      }
      nstate[n] = val;
    }
    return nstate;
  }

  // Given a mode and a state (for that mode), find the inner mode and
  // state at the position that the state refers to.
  function innerMode(mode, state) {
    var info;
    while (mode.innerMode) {
      info = mode.innerMode(state);
      if (!info || info.mode == mode) {
        break;
      }
      state = info.state;
      mode = info.mode;
    }
    return info || { mode: mode, state: state };
  }

  function startState(mode, a1, a2) {
    return mode.startState ? mode.startState(a1, a2) : true;
  }

  // STRING STREAM

  // Fed to the mode parsers, provides helper functions to make
  // parsers more succinct.

  var StringStream = function (string, tabSize, lineOracle) {
    this.pos = this.start = 0;
    this.string = string;
    this.tabSize = tabSize || 8;
    this.lastColumnPos = this.lastColumnValue = 0;
    this.lineStart = 0;
    this.lineOracle = lineOracle;
  };

  StringStream.prototype.eol = function () {
    return this.pos >= this.string.length;
  };
  StringStream.prototype.sol = function () {
    return this.pos == this.lineStart;
  };
  StringStream.prototype.peek = function () {
    return this.string.charAt(this.pos) || undefined;
  };
  StringStream.prototype.next = function () {
    if (this.pos < this.string.length) {
      return this.string.charAt(this.pos++);
    }
  };
  StringStream.prototype.eat = function (match) {
    var ch = this.string.charAt(this.pos);
    var ok;
    if (typeof match == "string") {
      ok = ch == match;
    } else {
      ok = ch && (match.test ? match.test(ch) : match(ch));
    }
    if (ok) {
      ++this.pos;
      return ch;
    }
  };
  StringStream.prototype.eatWhile = function (match) {
    var start = this.pos;
    while (this.eat(match)) {}
    return this.pos > start;
  };
  StringStream.prototype.eatSpace = function () {
    var start = this.pos;
    while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) {
      ++this.pos;
    }
    return this.pos > start;
  };
  StringStream.prototype.skipToEnd = function () {
    this.pos = this.string.length;
  };
  StringStream.prototype.skipTo = function (ch) {
    var found = this.string.indexOf(ch, this.pos);
    if (found > -1) {
      this.pos = found;
      return true;
    }
  };
  StringStream.prototype.backUp = function (n) {
    this.pos -= n;
  };
  StringStream.prototype.column = function () {
    if (this.lastColumnPos < this.start) {
      this.lastColumnValue = countColumn(
        this.string,
        this.start,
        this.tabSize,
        this.lastColumnPos,
        this.lastColumnValue
      );
      this.lastColumnPos = this.start;
    }
    return (
      this.lastColumnValue -
      (this.lineStart
        ? countColumn(this.string, this.lineStart, this.tabSize)
        : 0)
    );
  };
  StringStream.prototype.indentation = function () {
    return (
      countColumn(this.string, null, this.tabSize) -
      (this.lineStart
        ? countColumn(this.string, this.lineStart, this.tabSize)
        : 0)
    );
  };
  StringStream.prototype.match = function (pattern, consume, caseInsensitive) {
    if (typeof pattern == "string") {
      var cased = function (str) {
        return caseInsensitive ? str.toLowerCase() : str;
      };
      var substr = this.string.substr(this.pos, pattern.length);
      if (cased(substr) == cased(pattern)) {
        if (consume !== false) {
          this.pos += pattern.length;
        }
        return true;
      }
    } else {
      var match = this.string.slice(this.pos).match(pattern);
      if (match && match.index > 0) {
        return null;
      }
      if (match && consume !== false) {
        this.pos += match[0].length;
      }
      return match;
    }
  };
  StringStream.prototype.current = function () {
    return this.string.slice(this.start, this.pos);
  };
  StringStream.prototype.hideFirstChars = function (n, inner) {
    this.lineStart += n;
    try {
      return inner();
    } finally {
      this.lineStart -= n;
    }
  };
  StringStream.prototype.lookAhead = function (n) {
    var oracle = this.lineOracle;
    return oracle && oracle.lookAhead(n);
  };
  StringStream.prototype.baseToken = function () {
    var oracle = this.lineOracle;
    return oracle && oracle.baseToken(this.pos);
  };

  // Find the line object corresponding to the given line number.
  function getLine(doc, n) {
    n -= doc.first;
    if (n < 0 || n >= doc.size) {
      throw new Error(
        "There is no line " + (n + doc.first) + " in the document."
      );
    }
    var chunk = doc;
    while (!chunk.lines) {
      for (var i = 0; ; ++i) {
        var child = chunk.children[i],
          sz = child.chunkSize();
        if (n < sz) {
          chunk = child;
          break;
        }
        n -= sz;
      }
    }
    return chunk.lines[n];
  }

  // Get the part of a document between two positions, as an array of
  // strings.
  function getBetween(doc, start, end) {
    var out = [],
      n = start.line;
    doc.iter(start.line, end.line + 1, function (line) {
      var text = line.text;
      if (n == end.line) {
        text = text.slice(0, end.ch);
      }
      if (n == start.line) {
        text = text.slice(start.ch);
      }
      out.push(text);
      ++n;
    });
    return out;
  }
  // Get the lines between from and to, as array of strings.
  function getLines(doc, from, to) {
    var out = [];
    doc.iter(from, to, function (line) {
      out.push(line.text);
    }); // iter aborts when callback returns truthy value
    return out;
  }

  // Update the height of a line, propagating the height change
  // upwards to parent nodes.
  function updateLineHeight(line, height) {
    var diff = height - line.height;
    if (diff) {
      for (var n = line; n; n = n.parent) {
        n.height += diff;
      }
    }
  }

  // Given a line object, find its line number by walking up through
  // its parent links.
  function lineNo(line) {
    if (line.parent == null) {
      return null;
    }
    var cur = line.parent,
      no = indexOf(cur.lines, line);
    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
      for (var i = 0; ; ++i) {
        if (chunk.children[i] == cur) {
          break;
        }
        no += chunk.children[i].chunkSize();
      }
    }
    return no + cur.first;
  }

  // Find the line at the given vertical position, using the height
  // information in the document tree.
  function lineAtHeight(chunk, h) {
    var n = chunk.first;
    outer: do {
      for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
        var child = chunk.children[i$1],
          ch = child.height;
        if (h < ch) {
          chunk = child;
          continue outer;
        }
        h -= ch;
        n += child.chunkSize();
      }
      return n;
    } while (!chunk.lines);
    var i = 0;
    for (; i < chunk.lines.length; ++i) {
      var line = chunk.lines[i],
        lh = line.height;
      if (h < lh) {
        break;
      }
      h -= lh;
    }
    return n + i;
  }

  function isLine(doc, l) {
    return l >= doc.first && l < doc.first + doc.size;
  }

  function lineNumberFor(options, i) {
    return String(options.lineNumberFormatter(i + options.firstLineNumber));
  }

  // A Pos instance represents a position within the text.
  function Pos(line, ch, sticky) {
    if (sticky === void 0) sticky = null;

    if (!(this instanceof Pos)) {
      return new Pos(line, ch, sticky);
    }
    this.line = line;
    this.ch = ch;
    this.sticky = sticky;
  }

  // Compare two positions, return 0 if they are the same, a negative
  // number when a is less, and a positive number otherwise.
  function cmp(a, b) {
    return a.line - b.line || a.ch - b.ch;
  }

  function equalCursorPos(a, b) {
    return a.sticky == b.sticky && cmp(a, b) == 0;
  }

  function copyPos(x) {
    return Pos(x.line, x.ch);
  }
  function maxPos(a, b) {
    return cmp(a, b) < 0 ? b : a;
  }
  function minPos(a, b) {
    return cmp(a, b) < 0 ? a : b;
  }

  // Most of the external API clips given positions to make sure they
  // actually exist within the document.
  function clipLine(doc, n) {
    return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1));
  }
  function clipPos(doc, pos) {
    if (pos.line < doc.first) {
      return Pos(doc.first, 0);
    }
    var last = doc.first + doc.size - 1;
    if (pos.line > last) {
      return Pos(last, getLine(doc, last).text.length);
    }
    return clipToLen(pos, getLine(doc, pos.line).text.length);
  }
  function clipToLen(pos, linelen) {
    var ch = pos.ch;
    if (ch == null || ch > linelen) {
      return Pos(pos.line, linelen);
    } else if (ch < 0) {
      return Pos(pos.line, 0);
    } else {
      return pos;
    }
  }
  function clipPosArray(doc, array) {
    var out = [];
    for (var i = 0; i < array.length; i++) {
      out[i] = clipPos(doc, array[i]);
    }
    return out;
  }

  var SavedContext = function (state, lookAhead) {
    this.state = state;
    this.lookAhead = lookAhead;
  };

  var Context = function (doc, state, line, lookAhead) {
    this.state = state;
    this.doc = doc;
    this.line = line;
    this.maxLookAhead = lookAhead || 0;
    this.baseTokens = null;
    this.baseTokenPos = 1;
  };

  Context.prototype.lookAhead = function (n) {
    var line = this.doc.getLine(this.line + n);
    if (line != null && n > this.maxLookAhead) {
      this.maxLookAhead = n;
    }
    return line;
  };

  Context.prototype.baseToken = function (n) {
    if (!this.baseTokens) {
      return null;
    }
    while (this.baseTokens[this.baseTokenPos] <= n) {
      this.baseTokenPos += 2;
    }
    var type = this.baseTokens[this.baseTokenPos + 1];
    return {
      type: type && type.replace(/( |^)overlay .*/, ""),
      size: this.baseTokens[this.baseTokenPos] - n,
    };
  };

  Context.prototype.nextLine = function () {
    this.line++;
    if (this.maxLookAhead > 0) {
      this.maxLookAhead--;
    }
  };

  Context.fromSaved = function (doc, saved, line) {
    if (saved instanceof SavedContext) {
      return new Context(
        doc,
        copyState(doc.mode, saved.state),
        line,
        saved.lookAhead
      );
    } else {
      return new Context(doc, copyState(doc.mode, saved), line);
    }
  };

  Context.prototype.save = function (copy) {
    var state =
      copy !== false ? copyState(this.doc.mode, this.state) : this.state;
    return this.maxLookAhead > 0
      ? new SavedContext(state, this.maxLookAhead)
      : state;
  };

  // Compute a style array (an array starting with a mode generation
  // -- for invalidation -- followed by pairs of end positions and
  // style strings), which is used to highlight the tokens on the
  // line.
  function highlightLine(cm, line, context, forceToEnd) {
    // A styles array always starts with a number identifying the
    // mode/overlays that it is based on (for easy invalidation).
    var st = [cm.state.modeGen],
      lineClasses = {};
    // Compute the base array of styles
    runMode(
      cm,
      line.text,
      cm.doc.mode,
      context,
      function (end, style) {
        return st.push(end, style);
      },
      lineClasses,
      forceToEnd
    );
    var state = context.state;

    // Run overlays, adjust style array.
    var loop = function (o) {
      context.baseTokens = st;
      var overlay = cm.state.overlays[o],
        i = 1,
        at = 0;
      context.state = true;
      runMode(
        cm,
        line.text,
        overlay.mode,
        context,
        function (end, style) {
          var start = i;
          // Ensure there's a token end at the current position, and that i points at it
          while (at < end) {
            var i_end = st[i];
            if (i_end > end) {
              st.splice(i, 1, end, st[i + 1], i_end);
            }
            i += 2;
            at = Math.min(end, i_end);
          }
          if (!style) {
            return;
          }
          if (overlay.opaque) {
            st.splice(start, i - start, end, "overlay " + style);
            i = start + 2;
          } else {
            for (; start < i; start += 2) {
              var cur = st[start + 1];
              st[start + 1] = (cur ? cur + " " : "") + "overlay " + style;
            }
          }
        },
        lineClasses
      );
      context.state = state;
      context.baseTokens = null;
      context.baseTokenPos = 1;
    };

    for (var o = 0; o < cm.state.overlays.length; ++o) loop(o);

    return {
      styles: st,
      classes:
        lineClasses.bgClass || lineClasses.textClass ? lineClasses : null,
    };
  }

  function getLineStyles(cm, line, updateFrontier) {
    if (!line.styles || line.styles[0] != cm.state.modeGen) {
      var context = getContextBefore(cm, lineNo(line));
      var resetState =
        line.text.length > cm.options.maxHighlightLength &&
        copyState(cm.doc.mode, context.state);
      var result = highlightLine(cm, line, context);
      if (resetState) {
        context.state = resetState;
      }
      line.stateAfter = context.save(!resetState);
      line.styles = result.styles;
      if (result.classes) {
        line.styleClasses = result.classes;
      } else if (line.styleClasses) {
        line.styleClasses = null;
      }
      if (updateFrontier === cm.doc.highlightFrontier) {
        cm.doc.modeFrontier = Math.max(
          cm.doc.modeFrontier,
          ++cm.doc.highlightFrontier
        );
      }
    }
    return line.styles;
  }

  function getContextBefore(cm, n, precise) {
    var doc = cm.doc,
      display = cm.display;
    if (!doc.mode.startState) {
      return new Context(doc, true, n);
    }
    var start = findStartLine(cm, n, precise);
    var saved = start > doc.first && getLine(doc, start - 1).stateAfter;
    var context = saved
      ? Context.fromSaved(doc, saved, start)
      : new Context(doc, startState(doc.mode), start);

    doc.iter(start, n, function (line) {
      processLine(cm, line.text, context);
      var pos = context.line;
      line.stateAfter =
        pos == n - 1 ||
        pos % 5 == 0 ||
        (pos >= display.viewFrom && pos < display.viewTo)
          ? context.save()
          : null;
      context.nextLine();
    });
    if (precise) {
      doc.modeFrontier = context.line;
    }
    return context;
  }

  // Lightweight form of highlight -- proceed over this line and
  // update state, but don't save a style array. Used for lines that
  // aren't currently visible.
  function processLine(cm, text, context, startAt) {
    var mode = cm.doc.mode;
    var stream = new StringStream(text, cm.options.tabSize, context);
    stream.start = stream.pos = startAt || 0;
    if (text == "") {
      callBlankLine(mode, context.state);
    }
    while (!stream.eol()) {
      readToken(mode, stream, context.state);
      stream.start = stream.pos;
    }
  }

  function callBlankLine(mode, state) {
    if (mode.blankLine) {
      return mode.blankLine(state);
    }
    if (!mode.innerMode) {
      return;
    }
    var inner = innerMode(mode, state);
    if (inner.mode.blankLine) {
      return inner.mode.blankLine(inner.state);
    }
  }

  function readToken(mode, stream, state, inner) {
    for (var i = 0; i < 10; i++) {
      if (inner) {
        inner[0] = innerMode(mode, state).mode;
      }
      var style = mode.token(stream, state);
      if (stream.pos > stream.start) {
        return style;
      }
    }
    throw new Error("Mode " + mode.name + " failed to advance stream.");
  }

  var Token = function (stream, type, state) {
    this.start = stream.start;
    this.end = stream.pos;
    this.string = stream.current();
    this.type = type || null;
    this.state = state;
  };

  // Utility for getTokenAt and getLineTokens
  function takeToken(cm, pos, precise, asArray) {
    var doc = cm.doc,
      mode = doc.mode,
      style;
    pos = clipPos(doc, pos);
    var line = getLine(doc, pos.line),
      context = getContextBefore(cm, pos.line, precise);
    var stream = new StringStream(line.text, cm.options.tabSize, context),
      tokens;
    if (asArray) {
      tokens = [];
    }
    while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
      stream.start = stream.pos;
      style = readToken(mode, stream, context.state);
      if (asArray) {
        tokens.push(
          new Token(stream, style, copyState(doc.mode, context.state))
        );
      }
    }
    return asArray ? tokens : new Token(stream, style, context.state);
  }

  function extractLineClasses(type, output) {
    if (type) {
      for (;;) {
        var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
        if (!lineClass) {
          break;
        }
        type =
          type.slice(0, lineClass.index) +
          type.slice(lineClass.index + lineClass[0].length);
        var prop = lineClass[1] ? "bgClass" : "textClass";
        if (output[prop] == null) {
          output[prop] = lineClass[2];
        } else if (
          !new RegExp("(?:^|\\s)" + lineClass[2] + "(?:$|\\s)").test(
            output[prop]
          )
        ) {
          output[prop] += " " + lineClass[2];
        }
      }
    }
    return type;
  }

  // Run the given mode's parser over a line, calling f for each token.
  function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
    var flattenSpans = mode.flattenSpans;
    if (flattenSpans == null) {
      flattenSpans = cm.options.flattenSpans;
    }
    var curStart = 0,
      curStyle = null;
    var stream = new StringStream(text, cm.options.tabSize, context),
      style;
    var inner = cm.options.addModeClass && [null];
    if (text == "") {
      extractLineClasses(callBlankLine(mode, context.state), lineClasses);
    }
    while (!stream.eol()) {
      if (stream.pos > cm.options.maxHighlightLength) {
        flattenSpans = false;
        if (forceToEnd) {
          processLine(cm, text, context, stream.pos);
        }
        stream.pos = text.length;
        style = null;
      } else {
        style = extractLineClasses(
          readToken(mode, stream, context.state, inner),
          lineClasses
        );
      }
      if (inner) {
        var mName = inner[0].name;
        if (mName) {
          style = "m-" + (style ? mName + " " + style : mName);
        }
      }
      if (!flattenSpans || curStyle != style) {
        while (curStart < stream.start) {
          curStart = Math.min(stream.start, curStart + 5000);
          f(curStart, curStyle);
        }
        curStyle = style;
      }
      stream.start = stream.pos;
    }
    while (curStart < stream.pos) {
      // Webkit seems to refuse to render text nodes longer than 57444
      // characters, and returns inaccurate measurements in nodes
      // starting around 5000 chars.
      var pos = Math.min(stream.pos, curStart + 5000);
      f(pos, curStyle);
      curStart = pos;
    }
  }

  // Finds the line to start with when starting a parse. Tries to
  // find a line with a stateAfter, so that it can start with a
  // valid state. If that fails, it returns the line with the
  // smallest indentation, which tends to need the least context to
  // parse correctly.
  function findStartLine(cm, n, precise) {
    var minindent,
      minline,
      doc = cm.doc;
    var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
    for (var search = n; search > lim; --search) {
      if (search <= doc.first) {
        return doc.first;
      }
      var line = getLine(doc, search - 1),
        after = line.stateAfter;
      if (
        after &&
        (!precise ||
          search + (after instanceof SavedContext ? after.lookAhead : 0) <=
            doc.modeFrontier)
      ) {
        return search;
      }
      var indented = countColumn(line.text, null, cm.options.tabSize);
      if (minline == null || minindent > indented) {
        minline = search - 1;
        minindent = indented;
      }
    }
    return minline;
  }

  function retreatFrontier(doc, n) {
    doc.modeFrontier = Math.min(doc.modeFrontier, n);
    if (doc.highlightFrontier < n - 10) {
      return;
    }
    var start = doc.first;
    for (var line = n - 1; line > start; line--) {
      var saved = getLine(doc, line).stateAfter;
      // change is on 3
      // state on line 1 looked ahead 2 -- so saw 3
      // test 1 + 2 < 3 should cover this
      if (
        saved &&
        (!(saved instanceof SavedContext) || line + saved.lookAhead < n)
      ) {
        start = line + 1;
        break;
      }
    }
    doc.highlightFrontier = Math.min(doc.highlightFrontier, start);
  }

  // Optimize some code when these features are not used.
  var sawReadOnlySpans = false,
    sawCollapsedSpans = false;

  function seeReadOnlySpans() {
    sawReadOnlySpans = true;
  }

  function seeCollapsedSpans() {
    sawCollapsedSpans = true;
  }

  // TEXTMARKER SPANS

  function MarkedSpan(marker, from, to) {
    this.marker = marker;
    this.from = from;
    this.to = to;
  }

  // Search an array of spans for a span matching the given marker.
  function getMarkedSpanFor(spans, marker) {
    if (spans) {
      for (var i = 0; i < spans.length; ++i) {
        var span = spans[i];
        if (span.marker == marker) {
          return span;
        }
      }
    }
  }

  // Remove a span from an array, returning undefined if no spans are
  // left (we don't store arrays for lines without spans).
  function removeMarkedSpan(spans, span) {
    var r;
    for (var i = 0; i < spans.length; ++i) {
      if (spans[i] != span) {
        (r || (r = [])).push(spans[i]);
      }
    }
    return r;
  }

  // Add a span to a line.
  function addMarkedSpan(line, span, op) {
    var inThisOp =
      op &&
      window.WeakSet &&
      (op.markedSpans || (op.markedSpans = new WeakSet()));
    if (inThisOp && inThisOp.has(line.markedSpans)) {
      line.markedSpans.push(span);
    } else {
      line.markedSpans = line.markedSpans
        ? line.markedSpans.concat([span])
        : [span];
      if (inThisOp) {
        inThisOp.add(line.markedSpans);
      }
    }
    span.marker.attachLine(line);
  }

  // Used for the algorithm that adjusts markers for a change in the
  // document. These functions cut an array of spans at a given
  // character position, returning an array of remaining chunks (or
  // undefined if nothing remains).
  function markedSpansBefore(old, startCh, isInsert) {
    var nw;
    if (old) {
      for (var i = 0; i < old.length; ++i) {
        var span = old[i],
          marker = span.marker;
        var startsBefore =
          span.from == null ||
          (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
        if (
          startsBefore ||
          (span.from == startCh &&
            marker.type == "bookmark" &&
            (!isInsert || !span.marker.insertLeft))
        ) {
          var endsAfter =
            span.to == null ||
            (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
          (nw || (nw = [])).push(
            new MarkedSpan(marker, span.from, endsAfter ? null : span.to)
          );
        }
      }
    }
    return nw;
  }
  function markedSpansAfter(old, endCh, isInsert) {
    var nw;
    if (old) {
      for (var i = 0; i < old.length; ++i) {
        var span = old[i],
          marker = span.marker;
        var endsAfter =
          span.to == null ||
          (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
        if (
          endsAfter ||
          (span.from == endCh &&
            marker.type == "bookmark" &&
            (!isInsert || span.marker.insertLeft))
        ) {
          var startsBefore =
            span.from == null ||
            (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
          (nw || (nw = [])).push(
            new MarkedSpan(
              marker,
              startsBefore ? null : span.from - endCh,
              span.to == null ? null : span.to - endCh
            )
          );
        }
      }
    }
    return nw;
  }

  // Given a change object, compute the new set of marker spans that
  // cover the line in which the change took place. Removes spans
  // entirely within the change, reconnects spans belonging to the
  // same marker that appear on both sides of the change, and cuts off
  // spans partially within the change. Returns an array of span
  // arrays with one element for each line in (after) the change.
  function stretchSpansOverChange(doc, change) {
    if (change.full) {
      return null;
    }
    var oldFirst =
      isLine(doc, change.from.line) &&
      getLine(doc, change.from.line).markedSpans;
    var oldLast =
      isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
    if (!oldFirst && !oldLast) {
      return null;
    }

    var startCh = change.from.ch,
      endCh = change.to.ch,
      isInsert = cmp(change.from, change.to) == 0;
    // Get the spans that 'stick out' on both sides
    var first = markedSpansBefore(oldFirst, startCh, isInsert);
    var last = markedSpansAfter(oldLast, endCh, isInsert);

    // Next, merge those two ends
    var sameLine = change.text.length == 1,
      offset = lst(change.text).length + (sameLine ? startCh : 0);
    if (first) {
      // Fix up .to properties of first
      for (var i = 0; i < first.length; ++i) {
        var span = first[i];
        if (span.to == null) {
          var found = getMarkedSpanFor(last, span.marker);
          if (!found) {
            span.to = startCh;
          } else if (sameLine) {
            span.to = found.to == null ? null : found.to + offset;
          }
        }
      }
    }
    if (last) {
      // Fix up .from in last (or move them into first in case of sameLine)
      for (var i$1 = 0; i$1 < last.length; ++i$1) {
        var span$1 = last[i$1];
        if (span$1.to != null) {
          span$1.to += offset;
        }
        if (span$1.from == null) {
          var found$1 = getMarkedSpanFor(first, span$1.marker);
          if (!found$1) {
            span$1.from = offset;
            if (sameLine) {
              (first || (first = [])).push(span$1);
            }
          }
        } else {
          span$1.from += offset;
          if (sameLine) {
            (first || (first = [])).push(span$1);
          }
        }
      }
    }
    // Make sure we didn't create any zero-length spans
    if (first) {
      first = clearEmptySpans(first);
    }
    if (last && last != first) {
      last = clearEmptySpans(last);
    }

    var newMarkers = [first];
    if (!sameLine) {
      // Fill gap with whole-line-spans
      var gap = change.text.length - 2,
        gapMarkers;
      if (gap > 0 && first) {
        for (var i$2 = 0; i$2 < first.length; ++i$2) {
          if (first[i$2].to == null) {
            (gapMarkers || (gapMarkers = [])).push(
              new MarkedSpan(first[i$2].marker, null, null)
            );
          }
        }
      }
      for (var i$3 = 0; i$3 < gap; ++i$3) {
        newMarkers.push(gapMarkers);
      }
      newMarkers.push(last);
    }
    return newMarkers;
  }

  // Remove spans that are empty and don't have a clearWhenEmpty
  // option of false.
  function clearEmptySpans(spans) {
    for (var i = 0; i < spans.length; ++i) {
      var span = spans[i];
      if (
        span.from != null &&
        span.from == span.to &&
        span.marker.clearWhenEmpty !== false
      ) {
        spans.splice(i--, 1);
      }
    }
    if (!spans.length) {
      return null;
    }
    return spans;
  }

  // Used to 'clip' out readOnly ranges when making a change.
  function removeReadOnlyRanges(doc, from, to) {
    var markers = null;
    doc.iter(from.line, to.line + 1, function (line) {
      if (line.markedSpans) {
        for (var i = 0; i < line.markedSpans.length; ++i) {
          var mark = line.markedSpans[i].marker;
          if (mark.readOnly && (!markers || indexOf(markers, mark) == -1)) {
            (markers || (markers = [])).push(mark);
          }
        }
      }
    });
    if (!markers) {
      return null;
    }
    var parts = [{ from: from, to: to }];
    for (var i = 0; i < markers.length; ++i) {
      var mk = markers[i],
        m = mk.find(0);
      for (var j = 0; j < parts.length; ++j) {
        var p = parts[j];
        if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) {
          continue;
        }
        var newParts = [j, 1],
          dfrom = cmp(p.from, m.from),
          dto = cmp(p.to, m.to);
        if (dfrom < 0 || (!mk.inclusiveLeft && !dfrom)) {
          newParts.push({ from: p.from, to: m.from });
        }
        if (dto > 0 || (!mk.inclusiveRight && !dto)) {
          newParts.push({ from: m.to, to: p.to });
        }
        parts.splice.apply(parts, newParts);
        j += newParts.length - 3;
      }
    }
    return parts;
  }

  // Connect or disconnect spans from a line.
  function detachMarkedSpans(line) {
    var spans = line.markedSpans;
    if (!spans) {
      return;
    }
    for (var i = 0; i < spans.length; ++i) {
      spans[i].marker.detachLine(line);
    }
    line.markedSpans = null;
  }
  function attachMarkedSpans(line, spans) {
    if (!spans) {
      return;
    }
    for (var i = 0; i < spans.length; ++i) {
      spans[i].marker.attachLine(line);
    }
    line.markedSpans = spans;
  }

  // Helpers used when computing which overlapping collapsed span
  // counts as the larger one.
  function extraLeft(marker) {
    return marker.inclusiveLeft ? -1 : 0;
  }
  function extraRight(marker) {
    return marker.inclusiveRight ? 1 : 0;
  }

  // Returns a number indicating which of two overlapping collapsed
  // spans is larger (and thus includes the other). Falls back to
  // comparing ids when the spans cover exactly the same range.
  function compareCollapsedMarkers(a, b) {
    var lenDiff = a.lines.length - b.lines.length;
    if (lenDiff != 0) {
      return lenDiff;
    }
    var aPos = a.find(),
      bPos = b.find();
    var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
    if (fromCmp) {
      return -fromCmp;
    }
    var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
    if (toCmp) {
      return toCmp;
    }
    return b.id - a.id;
  }

  // Find out whether a line ends or starts in a collapsed span. If
  // so, return the marker for that span.
  function collapsedSpanAtSide(line, start) {
    var sps = sawCollapsedSpans && line.markedSpans,
      found;
    if (sps) {
      for (var sp = void 0, i = 0; i < sps.length; ++i) {
        sp = sps[i];
        if (
          sp.marker.collapsed &&
          (start ? sp.from : sp.to) == null &&
          (!found || compareCollapsedMarkers(found, sp.marker) < 0)
        ) {
          found = sp.marker;
        }
      }
    }
    return found;
  }
  function collapsedSpanAtStart(line) {
    return collapsedSpanAtSide(line, true);
  }
  function collapsedSpanAtEnd(line) {
    return collapsedSpanAtSide(line, false);
  }

  function collapsedSpanAround(line, ch) {
    var sps = sawCollapsedSpans && line.markedSpans,
      found;
    if (sps) {
      for (var i = 0; i < sps.length; ++i) {
        var sp = sps[i];
        if (
          sp.marker.collapsed &&
          (sp.from == null || sp.from < ch) &&
          (sp.to == null || sp.to > ch) &&
          (!found || compareCollapsedMarkers(found, sp.marker) < 0)
        ) {
          found = sp.marker;
        }
      }
    }
    return found;
  }

  // Test whether there exists a collapsed span that partially
  // overlaps (covers the start or end, but not both) of a new span.
  // Such overlap is not allowed.
  function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
    var line = getLine(doc, lineNo);
    var sps = sawCollapsedSpans && line.markedSpans;
    if (sps) {
      for (var i = 0; i < sps.length; ++i) {
        var sp = sps[i];
        if (!sp.marker.collapsed) {
          continue;
        }
        var found = sp.marker.find(0);
        var fromCmp =
          cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
        var toCmp =
          cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
        if ((fromCmp >= 0 && toCmp <= 0) || (fromCmp <= 0 && toCmp >= 0)) {
          continue;
        }
        if (
          (fromCmp <= 0 &&
            (sp.marker.inclusiveRight && marker.inclusiveLeft
              ? cmp(found.to, from) >= 0
              : cmp(found.to, from) > 0)) ||
          (fromCmp >= 0 &&
            (sp.marker.inclusiveRight && marker.inclusiveLeft
              ? cmp(found.from, to) <= 0
              : cmp(found.from, to) < 0))
        ) {
          return true;
        }
      }
    }
  }

  // A visual line is a line as drawn on the screen. Folding, for
  // example, can cause multiple logical lines to appear on the same
  // visual line. This finds the start of the visual line that the
  // given line is part of (usually that is the line itself).
  function visualLine(line) {
    var merged;
    while ((merged = collapsedSpanAtStart(line))) {
      line = merged.find(-1, true).line;
    }
    return line;
  }

  function visualLineEnd(line) {
    var merged;
    while ((merged = collapsedSpanAtEnd(line))) {
      line = merged.find(1, true).line;
    }
    return line;
  }

  // Returns an array of logical lines that continue the visual line
  // started by the argument, or undefined if there are no such lines.
  function visualLineContinued(line) {
    var merged, lines;
    while ((merged = collapsedSpanAtEnd(line))) {
      line = merged.find(1, true).line;
      (lines || (lines = [])).push(line);
    }
    return lines;
  }

  // Get the line number of the start of the visual line that the
  // given line number is part of.
  function visualLineNo(doc, lineN) {
    var line = getLine(doc, lineN),
      vis = visualLine(line);
    if (line == vis) {
      return lineN;
    }
    return lineNo(vis);
  }

  // Get the line number of the start of the next visual line after
  // the given line.
  function visualLineEndNo(doc, lineN) {
    if (lineN > doc.lastLine()) {
      return lineN;
    }
    var line = getLine(doc, lineN),
      merged;
    if (!lineIsHidden(doc, line)) {
      return lineN;
    }
    while ((merged = collapsedSpanAtEnd(line))) {
      line = merged.find(1, true).line;
    }
    return lineNo(line) + 1;
  }

  // Compute whether a line is hidden. Lines count as hidden when they
  // are part of a visual line that starts with another line, or when
  // they are entirely covered by collapsed, non-widget span.
  function lineIsHidden(doc, line) {
    var sps = sawCollapsedSpans && line.markedSpans;
    if (sps) {
      for (var sp = void 0, i = 0; i < sps.length; ++i) {
        sp = sps[i];
        if (!sp.marker.collapsed) {
          continue;
        }
        if (sp.from == null) {
          return true;
        }
        if (sp.marker.widgetNode) {
          continue;
        }
        if (
          sp.from == 0 &&
          sp.marker.inclusiveLeft &&
          lineIsHiddenInner(doc, line, sp)
        ) {
          return true;
        }
      }
    }
  }
  function lineIsHiddenInner(doc, line, span) {
    if (span.to == null) {
      var end = span.marker.find(1, true);
      return lineIsHiddenInner(
        doc,
        end.line,
        getMarkedSpanFor(end.line.markedSpans, span.marker)
      );
    }
    if (span.marker.inclusiveRight && span.to == line.text.length) {
      return true;
    }
    for (var sp = void 0, i = 0; i < line.markedSpans.length; ++i) {
      sp = line.markedSpans[i];
      if (
        sp.marker.collapsed &&
        !sp.marker.widgetNode &&
        sp.from == span.to &&
        (sp.to == null || sp.to != span.from) &&
        (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
        lineIsHiddenInner(doc, line, sp)
      ) {
        return true;
      }
    }
  }

  // Find the height above the given line.
  function heightAtLine(lineObj) {
    lineObj = visualLine(lineObj);

    var h = 0,
      chunk = lineObj.parent;
    for (var i = 0; i < chunk.lines.length; ++i) {
      var line = chunk.lines[i];
      if (line == lineObj) {
        break;
      } else {
        h += line.height;
      }
    }
    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
      for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
        var cur = p.children[i$1];
        if (cur == chunk) {
          break;
        } else {
          h += cur.height;
        }
      }
    }
    return h;
  }

  // Compute the character length of a line, taking into account
  // collapsed ranges (see markText) that might hide parts, and join
  // other lines onto it.
  function lineLength(line) {
    if (line.height == 0) {
      return 0;
    }
    var len = line.text.length,
      merged,
      cur = line;
    while ((merged = collapsedSpanAtStart(cur))) {
      var found = merged.find(0, true);
      cur = found.from.line;
      len += found.from.ch - found.to.ch;
    }
    cur = line;
    while ((merged = collapsedSpanAtEnd(cur))) {
      var found$1 = merged.find(0, true);
      len -= cur.text.length - found$1.from.ch;
      cur = found$1.to.line;
      len += cur.text.length - found$1.to.ch;
    }
    return len;
  }

  // Find the longest line in the document.
  function findMaxLine(cm) {
    var d = cm.display,
      doc = cm.doc;
    d.maxLine = getLine(doc, doc.first);
    d.maxLineLength = lineLength(d.maxLine);
    d.maxLineChanged = true;
    doc.iter(function (line) {
      var len = lineLength(line);
      if (len > d.maxLineLength) {
        d.maxLineLength = len;
        d.maxLine = line;
      }
    });
  }

  // LINE DATA STRUCTURE

  // Line objects. These hold state related to a line, including
  // highlighting info (the styles array).
  var Line = function (text, markedSpans, estimateHeight) {
    this.text = text;
    attachMarkedSpans(this, markedSpans);
    this.height = estimateHeight ? estimateHeight(this) : 1;
  };

  Line.prototype.lineNo = function () {
    return lineNo(this);
  };
  eventMixin(Line);

  // Change the content (text, markers) of a line. Automatically
  // invalidates cached information and tries to re-estimate the
  // line's height.
  function updateLine(line, text, markedSpans, estimateHeight) {
    line.text = text;
    if (line.stateAfter) {
      line.stateAfter = null;
    }
    if (line.styles) {
      line.styles = null;
    }
    if (line.order != null) {
      line.order = null;
    }
    detachMarkedSpans(line);
    attachMarkedSpans(line, markedSpans);
    var estHeight = estimateHeight ? estimateHeight(line) : 1;
    if (estHeight != line.height) {
      updateLineHeight(line, estHeight);
    }
  }

  // Detach a line from the document tree and its markers.
  function cleanUpLine(line) {
    line.parent = null;
    detachMarkedSpans(line);
  }

  // Convert a style as returned by a mode (either null, or a string
  // containing one or more styles) to a CSS style. This is cached,
  // and also looks for line-wide styles.
  var styleToClassCache = {},
    styleToClassCacheWithMode = {};
  function interpretTokenStyle(style, options) {
    if (!style || /^\s*$/.test(style)) {
      return null;
    }
    var cache = options.addModeClass
      ? styleToClassCacheWithMode
      : styleToClassCache;
    return cache[style] || (cache[style] = style.replace(/\S+/g, "cm-$&"));
  }

  // Render the DOM representation of the text of a line. Also builds
  // up a 'line map', which points at the DOM nodes that represent
  // specific stretches of text, and is used by the measuring code.
  // The returned object contains the DOM node, this map, and
  // information about line-wide styles that were set by the mode.
  function buildLineContent(cm, lineView) {
    // The padding-right forces the element to have a 'border', which
    // is needed on Webkit to be able to get line-level bounding
    // rectangles for it (in measureChar).
    var content = eltP(
      "span",
      null,
      null,
      webkit ? "padding-right: .1px" : null
    );
    var builder = {
      pre: eltP("pre", [content], "CodeMirror-line"),
      content: content,
      col: 0,
      pos: 0,
      cm: cm,
      trailingSpace: false,
      splitSpaces: cm.getOption("lineWrapping"),
    };
    lineView.measure = {};

    // Iterate over the logical lines that make up this visual line.
    for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
      var line = i ? lineView.rest[i - 1] : lineView.line,
        order = void 0;
      builder.pos = 0;
      builder.addToken = buildToken;
      // Optionally wire in some hacks into the token-rendering
      // algorithm, to deal with browser quirks.
      if (
        hasBadBidiRects(cm.display.measure) &&
        (order = getOrder(line, cm.doc.direction))
      ) {
        builder.addToken = buildTokenBadBidi(builder.addToken, order);
      }
      builder.map = [];
      var allowFrontierUpdate =
        lineView != cm.display.externalMeasured && lineNo(line);
      insertLineContent(
        line,
        builder,
        getLineStyles(cm, line, allowFrontierUpdate)
      );
      if (line.styleClasses) {
        if (line.styleClasses.bgClass) {
          builder.bgClass = joinClasses(
            line.styleClasses.bgClass,
            builder.bgClass || ""
          );
        }
        if (line.styleClasses.textClass) {
          builder.textClass = joinClasses(
            line.styleClasses.textClass,
            builder.textClass || ""
          );
        }
      }

      // Ensure at least a single node is present, for measuring.
      if (builder.map.length == 0) {
        builder.map.push(
          0,
          0,
          builder.content.appendChild(zeroWidthElement(cm.display.measure))
        );
      }

      // Store the map and a cache object for the current logical line
      if (i == 0) {
        lineView.measure.map = builder.map;
        lineView.measure.cache = {};
      } else {
        (lineView.measure.maps || (lineView.measure.maps = [])).push(
          builder.map
        );
        (lineView.measure.caches || (lineView.measure.caches = [])).push({});
      }
    }

    // See issue #2901
    if (webkit) {
      var last = builder.content.lastChild;
      if (
        /\bcm-tab\b/.test(last.className) ||
        (last.querySelector && last.querySelector(".cm-tab"))
      ) {
        builder.content.className = "cm-tab-wrap-hack";
      }
    }

    signal(cm, "renderLine", cm, lineView.line, builder.pre);
    if (builder.pre.className) {
      builder.textClass = joinClasses(
        builder.pre.className,
        builder.textClass || ""
      );
    }

    return builder;
  }

  function defaultSpecialCharPlaceholder(ch) {
    var token = elt("span", "\u2022", "cm-invalidchar");
    token.title = "\\u" + ch.charCodeAt(0).toString(16);
    token.setAttribute("aria-label", token.title);
    return token;
  }

  // Build up the DOM representation for a single token, and add it to
  // the line map. Takes care to render special characters separately.
  function buildToken(
    builder,
    text,
    style,
    startStyle,
    endStyle,
    css,
    attributes
  ) {
    if (!text) {
      return;
    }
    var displayText = builder.splitSpaces
      ? splitSpaces(text, builder.trailingSpace)
      : text;
    var special = builder.cm.state.specialChars,
      mustWrap = false;
    var content;
    if (!special.test(text)) {
      builder.col += text.length;
      content = document.createTextNode(displayText);
      builder.map.push(builder.pos, builder.pos + text.length, content);
      if (ie && ie_version < 9) {
        mustWrap = true;
      }
      builder.pos += text.length;
    } else {
      content = document.createDocumentFragment();
      var pos = 0;
      while (true) {
        special.lastIndex = pos;
        var m = special.exec(text);
        var skipped = m ? m.index - pos : text.length - pos;
        if (skipped) {
          var txt = document.createTextNode(
            displayText.slice(pos, pos + skipped)
          );
          if (ie && ie_version < 9) {
            content.appendChild(elt("span", [txt]));
          } else {
            content.appendChild(txt);
          }
          builder.map.push(builder.pos, builder.pos + skipped, txt);
          builder.col += skipped;
          builder.pos += skipped;
        }
        if (!m) {
          break;
        }
        pos += skipped + 1;
        var txt$1 = void 0;
        if (m[0] == "\t") {
          var tabSize = builder.cm.options.tabSize,
            tabWidth = tabSize - (builder.col % tabSize);
          txt$1 = content.appendChild(
            elt("span", spaceStr(tabWidth), "cm-tab")
          );
          txt$1.setAttribute("role", "presentation");
          txt$1.setAttribute("cm-text", "\t");
          builder.col += tabWidth;
        } else if (m[0] == "\r" || m[0] == "\n") {
          txt$1 = content.appendChild(
            elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar")
          );
          txt$1.setAttribute("cm-text", m[0]);
          builder.col += 1;
        } else {
          txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);
          txt$1.setAttribute("cm-text", m[0]);
          if (ie && ie_version < 9) {
            content.appendChild(elt("span", [txt$1]));
          } else {
            content.appendChild(txt$1);
          }
          builder.col += 1;
        }
        builder.map.push(builder.pos, builder.pos + 1, txt$1);
        builder.pos++;
      }
    }
    builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;
    if (style || startStyle || endStyle || mustWrap || css || attributes) {
      var fullStyle = style || "";
      if (startStyle) {
        fullStyle += startStyle;
      }
      if (endStyle) {
        fullStyle += endStyle;
      }
      var token = elt("span", [content], fullStyle, css);
      if (attributes) {
        for (var attr in attributes) {
          if (
            attributes.hasOwnProperty(attr) &&
            attr != "style" &&
            attr != "class"
          ) {
            token.setAttribute(attr, attributes[attr]);
          }
        }
      }
      return builder.content.appendChild(token);
    }
    builder.content.appendChild(content);
  }

  // Change some spaces to NBSP to prevent the browser from collapsing
  // trailing spaces at the end of a line when rendering text (issue #1362).
  function splitSpaces(text, trailingBefore) {
    if (text.length > 1 && !/  /.test(text)) {
      return text;
    }
    var spaceBefore = trailingBefore,
      result = "";
    for (var i = 0; i < text.length; i++) {
      var ch = text.charAt(i);
      if (
        ch == " " &&
        spaceBefore &&
        (i == text.length - 1 || text.charCodeAt(i + 1) == 32)
      ) {
        ch = "\u00a0";
      }
      result += ch;
      spaceBefore = ch == " ";
    }
    return result;
  }

  // Work around nonsense dimensions being reported for stretches of
  // right-to-left text.
  function buildTokenBadBidi(inner, order) {
    return function (
      builder,
      text,
      style,
      startStyle,
      endStyle,
      css,
      attributes
    ) {
      style = style ? style + " cm-force-border" : "cm-force-border";
      var start = builder.pos,
        end = start + text.length;
      for (;;) {
        // Find the part that overlaps with the start of this text
        var part = void 0;
        for (var i = 0; i < order.length; i++) {
          part = order[i];
          if (part.to > start && part.from <= start) {
            break;
          }
        }
        if (part.to >= end) {
          return inner(
            builder,
            text,
            style,
            startStyle,
            endStyle,
            css,
            attributes
          );
        }
        inner(
          builder,
          text.slice(0, part.to - start),
          style,
          startStyle,
          null,
          css,
          attributes
        );
        startStyle = null;
        text = text.slice(part.to - start);
        start = part.to;
      }
    };
  }

  function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
    var widget = !ignoreWidget && marker.widgetNode;
    if (widget) {
      builder.map.push(builder.pos, builder.pos + size, widget);
    }
    if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
      if (!widget) {
        widget = builder.content.appendChild(document.createElement("span"));
      }
      widget.setAttribute("cm-marker", marker.id);
    }
    if (widget) {
      builder.cm.display.input.setUneditable(widget);
      builder.content.appendChild(widget);
    }
    builder.pos += size;
    builder.trailingSpace = false;
  }

  // Outputs a number of spans to make up a line, taking highlighting
  // and marked text into account.
  function insertLineContent(line, builder, styles) {
    var spans = line.markedSpans,
      allText = line.text,
      at = 0;
    if (!spans) {
      for (var i$1 = 1; i$1 < styles.length; i$1 += 2) {
        builder.addToken(
          builder,
          allText.slice(at, (at = styles[i$1])),
          interpretTokenStyle(styles[i$1 + 1], builder.cm.options)
        );
      }
      return;
    }

    var len = allText.length,
      pos = 0,
      i = 1,
      text = "",
      style,
      css;
    var nextChange = 0,
      spanStyle,
      spanEndStyle,
      spanStartStyle,
      collapsed,
      attributes;
    for (;;) {
      if (nextChange == pos) {
        // Update current marker set
        spanStyle = spanEndStyle = spanStartStyle = css = "";
        attributes = null;
        collapsed = null;
        nextChange = Infinity;
        var foundBookmarks = [],
          endStyles = void 0;
        for (var j = 0; j < spans.length; ++j) {
          var sp = spans[j],
            m = sp.marker;
          if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
            foundBookmarks.push(m);
          } else if (
            sp.from <= pos &&
            (sp.to == null ||
              sp.to > pos ||
              (m.collapsed && sp.to == pos && sp.from == pos))
          ) {
            if (sp.to != null && sp.to != pos && nextChange > sp.to) {
              nextChange = sp.to;
              spanEndStyle = "";
            }
            if (m.className) {
              spanStyle += " " + m.className;
            }
            if (m.css) {
              css = (css ? css + ";" : "") + m.css;
            }
            if (m.startStyle && sp.from == pos) {
              spanStartStyle += " " + m.startStyle;
            }
            if (m.endStyle && sp.to == nextChange) {
              (endStyles || (endStyles = [])).push(m.endStyle, sp.to);
            }
            // support for the old title property
            // https://github.com/codemirror/CodeMirror/pull/5673
            if (m.title) {
              (attributes || (attributes = {})).title = m.title;
            }
            if (m.attributes) {
              for (var attr in m.attributes) {
                (attributes || (attributes = {}))[attr] = m.attributes[attr];
              }
            }
            if (
              m.collapsed &&
              (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0)
            ) {
              collapsed = sp;
            }
          } else if (sp.from > pos && nextChange > sp.from) {
            nextChange = sp.from;
          }
        }
        if (endStyles) {
          for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2) {
            if (endStyles[j$1 + 1] == nextChange) {
              spanEndStyle += " " + endStyles[j$1];
            }
          }
        }

        if (!collapsed || collapsed.from == pos) {
          for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2) {
            buildCollapsedSpan(builder, 0, foundBookmarks[j$2]);
          }
        }
        if (collapsed && (collapsed.from || 0) == pos) {
          buildCollapsedSpan(
            builder,
            (collapsed.to == null ? len + 1 : collapsed.to) - pos,
            collapsed.marker,
            collapsed.from == null
          );
          if (collapsed.to == null) {
            return;
          }
          if (collapsed.to == pos) {
            collapsed = false;
          }
        }
      }
      if (pos >= len) {
        break;
      }

      var upto = Math.min(len, nextChange);
      while (true) {
        if (text) {
          var end = pos + text.length;
          if (!collapsed) {
            var tokenText = end > upto ? text.slice(0, upto - pos) : text;
            builder.addToken(
              builder,
              tokenText,
              style ? style + spanStyle : spanStyle,
              spanStartStyle,
              pos + tokenText.length == nextChange ? spanEndStyle : "",
              css,
              attributes
            );
          }
          if (end >= upto) {
            text = text.slice(upto - pos);
            pos = upto;
            break;
          }
          pos = end;
          spanStartStyle = "";
        }
        text = allText.slice(at, (at = styles[i++]));
        style = interpretTokenStyle(styles[i++], builder.cm.options);
      }
    }
  }

  // These objects are used to represent the visible (currently drawn)
  // part of the document. A LineView may correspond to multiple
  // logical lines, if those are connected by collapsed ranges.
  function LineView(doc, line, lineN) {
    // The starting line
    this.line = line;
    // Continuing lines, if any
    this.rest = visualLineContinued(line);
    // Number of logical lines in this visual line
    this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
    this.node = this.text = null;
    this.hidden = lineIsHidden(doc, line);
  }

  // Create a range of LineView objects for the given lines.
  function buildViewArray(cm, from, to) {
    var array = [],
      nextPos;
    for (var pos = from; pos < to; pos = nextPos) {
      var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
      nextPos = pos + view.size;
      array.push(view);
    }
    return array;
  }

  var operationGroup = null;

  function pushOperation(op) {
    if (operationGroup) {
      operationGroup.ops.push(op);
    } else {
      op.ownsGroup = operationGroup = {
        ops: [op],
        delayedCallbacks: [],
      };
    }
  }

  function fireCallbacksForOps(group) {
    // Calls delayed callbacks and cursorActivity handlers until no
    // new ones appear
    var callbacks = group.delayedCallbacks,
      i = 0;
    do {
      for (; i < callbacks.length; i++) {
        callbacks[i].call(null);
      }
      for (var j = 0; j < group.ops.length; j++) {
        var op = group.ops[j];
        if (op.cursorActivityHandlers) {
          while (op.cursorActivityCalled < op.cursorActivityHandlers.length) {
            op.cursorActivityHandlers[op.cursorActivityCalled++].call(
              null,
              op.cm
            );
          }
        }
      }
    } while (i < callbacks.length);
  }

  function finishOperation(op, endCb) {
    var group = op.ownsGroup;
    if (!group) {
      return;
    }

    try {
      fireCallbacksForOps(group);
    } finally {
      operationGroup = null;
      endCb(group);
    }
  }

  var orphanDelayedCallbacks = null;

  // Often, we want to signal events at a point where we are in the
  // middle of some work, but don't want the handler to start calling
  // other methods on the editor, which might be in an inconsistent
  // state or simply not expect any other events to happen.
  // signalLater looks whether there are any handlers, and schedules
  // them to be executed when the last operation ends, or, if no
  // operation is active, when a timeout fires.
  function signalLater(emitter, type /*, values...*/) {
    var arr = getHandlers(emitter, type);
    if (!arr.length) {
      return;
    }
    var args = Array.prototype.slice.call(arguments, 2),
      list;
    if (operationGroup) {
      list = operationGroup.delayedCallbacks;
    } else if (orphanDelayedCallbacks) {
      list = orphanDelayedCallbacks;
    } else {
      list = orphanDelayedCallbacks = [];
      setTimeout(fireOrphanDelayed, 0);
    }
    var loop = function (i) {
      list.push(function () {
        return arr[i].apply(null, args);
      });
    };

    for (var i = 0; i < arr.length; ++i) loop(i);
  }

  function fireOrphanDelayed() {
    var delayed = orphanDelayedCallbacks;
    orphanDelayedCallbacks = null;
    for (var i = 0; i < delayed.length; ++i) {
      delayed[i]();
    }
  }

  // When an aspect of a line changes, a string is added to
  // lineView.changes. This updates the relevant part of the line's
  // DOM structure.
  function updateLineForChanges(cm, lineView, lineN, dims) {
    for (var j = 0; j < lineView.changes.length; j++) {
      var type = lineView.changes[j];
      if (type == "text") {
        updateLineText(cm, lineView);
      } else if (type == "gutter") {
        updateLineGutter(cm, lineView, lineN, dims);
      } else if (type == "class") {
        updateLineClasses(cm, lineView);
      } else if (type == "widget") {
        updateLineWidgets(cm, lineView, dims);
      }
    }
    lineView.changes = null;
  }

  // Lines with gutter elements, widgets or a background class need to
  // be wrapped, and have the extra elements added to the wrapper div
  function ensureLineWrapped(lineView) {
    if (lineView.node == lineView.text) {
      lineView.node = elt("div", null, null, "position: relative");
      if (lineView.text.parentNode) {
        lineView.text.parentNode.replaceChild(lineView.node, lineView.text);
      }
      lineView.node.appendChild(lineView.text);
      if (ie && ie_version < 8) {
        lineView.node.style.zIndex = 2;
      }
    }
    return lineView.node;
  }

  function updateLineBackground(cm, lineView) {
    var cls = lineView.bgClass
      ? lineView.bgClass + " " + (lineView.line.bgClass || "")
      : lineView.line.bgClass;
    if (cls) {
      cls += " CodeMirror-linebackground";
    }
    if (lineView.background) {
      if (cls) {
        lineView.background.className = cls;
      } else {
        lineView.background.parentNode.removeChild(lineView.background);
        lineView.background = null;
      }
    } else if (cls) {
      var wrap = ensureLineWrapped(lineView);
      lineView.background = wrap.insertBefore(
        elt("div", null, cls),
        wrap.firstChild
      );
      cm.display.input.setUneditable(lineView.background);
    }
  }

  // Wrapper around buildLineContent which will reuse the structure
  // in display.externalMeasured when possible.
  function getLineContent(cm, lineView) {
    var ext = cm.display.externalMeasured;
    if (ext && ext.line == lineView.line) {
      cm.display.externalMeasured = null;
      lineView.measure = ext.measure;
      return ext.built;
    }
    return buildLineContent(cm, lineView);
  }

  // Redraw the line's text. Interacts with the background and text
  // classes because the mode may output tokens that influence these
  // classes.
  function updateLineText(cm, lineView) {
    var cls = lineView.text.className;
    var built = getLineContent(cm, lineView);
    if (lineView.text == lineView.node) {
      lineView.node = built.pre;
    }
    lineView.text.parentNode.replaceChild(built.pre, lineView.text);
    lineView.text = built.pre;
    if (
      built.bgClass != lineView.bgClass ||
      built.textClass != lineView.textClass
    ) {
      lineView.bgClass = built.bgClass;
      lineView.textClass = built.textClass;
      updateLineClasses(cm, lineView);
    } else if (cls) {
      lineView.text.className = cls;
    }
  }

  function updateLineClasses(cm, lineView) {
    updateLineBackground(cm, lineView);
    if (lineView.line.wrapClass) {
      ensureLineWrapped(lineView).className = lineView.line.wrapClass;
    } else if (lineView.node != lineView.text) {
      lineView.node.className = "";
    }
    var textClass = lineView.textClass
      ? lineView.textClass + " " + (lineView.line.textClass || "")
      : lineView.line.textClass;
    lineView.text.className = textClass || "";
  }

  function updateLineGutter(cm, lineView, lineN, dims) {
    if (lineView.gutter) {
      lineView.node.removeChild(lineView.gutter);
      lineView.gutter = null;
    }
    if (lineView.gutterBackground) {
      lineView.node.removeChild(lineView.gutterBackground);
      lineView.gutterBackground = null;
    }
    if (lineView.line.gutterClass) {
      var wrap = ensureLineWrapped(lineView);
      lineView.gutterBackground = elt(
        "div",
        null,
        "CodeMirror-gutter-background " + lineView.line.gutterClass,
        "left: " +
          (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) +
          "px; width: " +
          dims.gutterTotalWidth +
          "px"
      );
      cm.display.input.setUneditable(lineView.gutterBackground);
      wrap.insertBefore(lineView.gutterBackground, lineView.text);
    }
    var markers = lineView.line.gutterMarkers;
    if (cm.options.lineNumbers || markers) {
      var wrap$1 = ensureLineWrapped(lineView);
      var gutterWrap = (lineView.gutter = elt(
        "div",
        null,
        "CodeMirror-gutter-wrapper",
        "left: " +
          (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) +
          "px"
      ));
      gutterWrap.setAttribute("aria-hidden", "true");
      cm.display.input.setUneditable(gutterWrap);
      wrap$1.insertBefore(gutterWrap, lineView.text);
      if (lineView.line.gutterClass) {
        gutterWrap.className += " " + lineView.line.gutterClass;
      }
      if (
        cm.options.lineNumbers &&
        (!markers || !markers["CodeMirror-linenumbers"])
      ) {
        lineView.lineNumber = gutterWrap.appendChild(
          elt(
            "div",
            lineNumberFor(cm.options, lineN),
            "CodeMirror-linenumber CodeMirror-gutter-elt",
            "left: " +
              dims.gutterLeft["CodeMirror-linenumbers"] +
              "px; width: " +
              cm.display.lineNumInnerWidth +
              "px"
          )
        );
      }
      if (markers) {
        for (var k = 0; k < cm.display.gutterSpecs.length; ++k) {
          var id = cm.display.gutterSpecs[k].className,
            found = markers.hasOwnProperty(id) && markers[id];
          if (found) {
            gutterWrap.appendChild(
              elt(
                "div",
                [found],
                "CodeMirror-gutter-elt",
                "left: " +
                  dims.gutterLeft[id] +
                  "px; width: " +
                  dims.gutterWidth[id] +
                  "px"
              )
            );
          }
        }
      }
    }
  }

  function updateLineWidgets(cm, lineView, dims) {
    if (lineView.alignable) {
      lineView.alignable = null;
    }
    var isWidget = classTest("CodeMirror-linewidget");
    for (
      var node = lineView.node.firstChild, next = void 0;
      node;
      node = next
    ) {
      next = node.nextSibling;
      if (isWidget.test(node.className)) {
        lineView.node.removeChild(node);
      }
    }
    insertLineWidgets(cm, lineView, dims);
  }

  // Build a line's DOM representation from scratch
  function buildLineElement(cm, lineView, lineN, dims) {
    var built = getLineContent(cm, lineView);
    lineView.text = lineView.node = built.pre;
    if (built.bgClass) {
      lineView.bgClass = built.bgClass;
    }
    if (built.textClass) {
      lineView.textClass = built.textClass;
    }

    updateLineClasses(cm, lineView);
    updateLineGutter(cm, lineView, lineN, dims);
    insertLineWidgets(cm, lineView, dims);
    return lineView.node;
  }

  // A lineView may contain multiple logical lines (when merged by
  // collapsed spans). The widgets for all of them need to be drawn.
  function insertLineWidgets(cm, lineView, dims) {
    insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
    if (lineView.rest) {
      for (var i = 0; i < lineView.rest.length; i++) {
        insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false);
      }
    }
  }

  function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
    if (!line.widgets) {
      return;
    }
    var wrap = ensureLineWrapped(lineView);
    for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
      var widget = ws[i],
        node = elt(
          "div",
          [widget.node],
          "CodeMirror-linewidget" +
            (widget.className ? " " + widget.className : "")
        );
      if (!widget.handleMouseEvents) {
        node.setAttribute("cm-ignore-events", "true");
      }
      positionLineWidget(widget, node, lineView, dims);
      cm.display.input.setUneditable(node);
      if (allowAbove && widget.above) {
        wrap.insertBefore(node, lineView.gutter || lineView.text);
      } else {
        wrap.appendChild(node);
      }
      signalLater(widget, "redraw");
    }
  }

  function positionLineWidget(widget, node, lineView, dims) {
    if (widget.noHScroll) {
      (lineView.alignable || (lineView.alignable = [])).push(node);
      var width = dims.wrapperWidth;
      node.style.left = dims.fixedPos + "px";
      if (!widget.coverGutter) {
        width -= dims.gutterTotalWidth;
        node.style.paddingLeft = dims.gutterTotalWidth + "px";
      }
      node.style.width = width + "px";
    }
    if (widget.coverGutter) {
      node.style.zIndex = 5;
      node.style.position = "relative";
      if (!widget.noHScroll) {
        node.style.marginLeft = -dims.gutterTotalWidth + "px";
      }
    }
  }

  function widgetHeight(widget) {
    if (widget.height != null) {
      return widget.height;
    }
    var cm = widget.doc.cm;
    if (!cm) {
      return 0;
    }
    if (!contains(document.body, widget.node)) {
      var parentStyle = "position: relative;";
      if (widget.coverGutter) {
        parentStyle +=
          "margin-left: -" + cm.display.gutters.offsetWidth + "px;";
      }
      if (widget.noHScroll) {
        parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;";
      }
      removeChildrenAndAdd(
        cm.display.measure,
        elt("div", [widget.node], null, parentStyle)
      );
    }
    return (widget.height = widget.node.parentNode.offsetHeight);
  }

  // Return true when the given mouse event happened in a widget
  function eventInWidget(display, e) {
    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
      if (
        !n ||
        (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
        (n.parentNode == display.sizer && n != display.mover)
      ) {
        return true;
      }
    }
  }

  // POSITION MEASUREMENT

  function paddingTop(display) {
    return display.lineSpace.offsetTop;
  }
  function paddingVert(display) {
    return display.mover.offsetHeight - display.lineSpace.offsetHeight;
  }
  function paddingH(display) {
    if (display.cachedPaddingH) {
      return display.cachedPaddingH;
    }
    var e = removeChildrenAndAdd(
      display.measure,
      elt("pre", "x", "CodeMirror-line-like")
    );
    var style = window.getComputedStyle
      ? window.getComputedStyle(e)
      : e.currentStyle;
    var data = {
      left: parseInt(style.paddingLeft),
      right: parseInt(style.paddingRight),
    };
    if (!isNaN(data.left) && !isNaN(data.right)) {
      display.cachedPaddingH = data;
    }
    return data;
  }

  function scrollGap(cm) {
    return scrollerGap - cm.display.nativeBarWidth;
  }
  function displayWidth(cm) {
    return (
      cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
    );
  }
  function displayHeight(cm) {
    return (
      cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
    );
  }

  // Ensure the lineView.wrapping.heights array is populated. This is
  // an array of bottom offsets for the lines that make up a drawn
  // line. When lineWrapping is on, there might be more than one
  // height.
  function ensureLineHeights(cm, lineView, rect) {
    var wrapping = cm.options.lineWrapping;
    var curWidth = wrapping && displayWidth(cm);
    if (
      !lineView.measure.heights ||
      (wrapping && lineView.measure.width != curWidth)
    ) {
      var heights = (lineView.measure.heights = []);
      if (wrapping) {
        lineView.measure.width = curWidth;
        var rects = lineView.text.firstChild.getClientRects();
        for (var i = 0; i < rects.length - 1; i++) {
          var cur = rects[i],
            next = rects[i + 1];
          if (Math.abs(cur.bottom - next.bottom) > 2) {
            heights.push((cur.bottom + next.top) / 2 - rect.top);
          }
        }
      }
      heights.push(rect.bottom - rect.top);
    }
  }

  // Find a line map (mapping character offsets to text nodes) and a
  // measurement cache for the given line number. (A line view might
  // contain multiple lines when collapsed ranges are present.)
  function mapFromLineView(lineView, line, lineN) {
    if (lineView.line == line) {
      return { map: lineView.measure.map, cache: lineView.measure.cache };
    }
    for (var i = 0; i < lineView.rest.length; i++) {
      if (lineView.rest[i] == line) {
        return {
          map: lineView.measure.maps[i],
          cache: lineView.measure.caches[i],
        };
      }
    }
    for (var i$1 = 0; i$1 < lineView.rest.length; i$1++) {
      if (lineNo(lineView.rest[i$1]) > lineN) {
        return {
          map: lineView.measure.maps[i$1],
          cache: lineView.measure.caches[i$1],
          before: true,
        };
      }
    }
  }

  // Render a line into the hidden node display.externalMeasured. Used
  // when measurement is needed for a line that's not in the viewport.
  function updateExternalMeasurement(cm, line) {
    line = visualLine(line);
    var lineN = lineNo(line);
    var view = (cm.display.externalMeasured = new LineView(
      cm.doc,
      line,
      lineN
    ));
    view.lineN = lineN;
    var built = (view.built = buildLineContent(cm, view));
    view.text = built.pre;
    removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
    return view;
  }

  // Get a {top, bottom, left, right} box (in line-local coordinates)
  // for a given character.
  function measureChar(cm, line, ch, bias) {
    return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias);
  }

  // Find a line view that corresponds to the given line number.
  function findViewForLine(cm, lineN) {
    if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo) {
      return cm.display.view[findViewIndex(cm, lineN)];
    }
    var ext = cm.display.externalMeasured;
    if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size) {
      return ext;
    }
  }

  // Measurement can be split in two steps, the set-up work that
  // applies to the whole line, and the measurement of the actual
  // character. Functions like coordsChar, that need to do a lot of
  // measurements in a row, can thus ensure that the set-up work is
  // only done once.
  function prepareMeasureForLine(cm, line) {
    var lineN = lineNo(line);
    var view = findViewForLine(cm, lineN);
    if (view && !view.text) {
      view = null;
    } else if (view && view.changes) {
      updateLineForChanges(cm, view, lineN, getDimensions(cm));
      cm.curOp.forceUpdate = true;
    }
    if (!view) {
      view = updateExternalMeasurement(cm, line);
    }

    var info = mapFromLineView(view, line, lineN);
    return {
      line: line,
      view: view,
      rect: null,
      map: info.map,
      cache: info.cache,
      before: info.before,
      hasHeights: false,
    };
  }

  // Given a prepared measurement object, measures the position of an
  // actual character (or fetches it from the cache).
  function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
    if (prepared.before) {
      ch = -1;
    }
    var key = ch + (bias || ""),
      found;
    if (prepared.cache.hasOwnProperty(key)) {
      found = prepared.cache[key];
    } else {
      if (!prepared.rect) {
        prepared.rect = prepared.view.text.getBoundingClientRect();
      }
      if (!prepared.hasHeights) {
        ensureLineHeights(cm, prepared.view, prepared.rect);
        prepared.hasHeights = true;
      }
      found = measureCharInner(cm, prepared, ch, bias);
      if (!found.bogus) {
        prepared.cache[key] = found;
      }
    }
    return {
      left: found.left,
      right: found.right,
      top: varHeight ? found.rtop : found.top,
      bottom: varHeight ? found.rbottom : found.bottom,
    };
  }

  var nullRect = { left: 0, right: 0, top: 0, bottom: 0 };

  function nodeAndOffsetInLineMap(map, ch, bias) {
    var node, start, end, collapse, mStart, mEnd;
    // First, search the line map for the text node corresponding to,
    // or closest to, the target character.
    for (var i = 0; i < map.length; i += 3) {
      mStart = map[i];
      mEnd = map[i + 1];
      if (ch < mStart) {
        start = 0;
        end = 1;
        collapse = "left";
      } else if (ch < mEnd) {
        start = ch - mStart;
        end = start + 1;
      } else if (i == map.length - 3 || (ch == mEnd && map[i + 3] > ch)) {
        end = mEnd - mStart;
        start = end - 1;
        if (ch >= mEnd) {
          collapse = "right";
        }
      }
      if (start != null) {
        node = map[i + 2];
        if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right")) {
          collapse = bias;
        }
        if (bias == "left" && start == 0) {
          while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
            node = map[(i -= 3) + 2];
            collapse = "left";
          }
        }
        if (bias == "right" && start == mEnd - mStart) {
          while (
            i < map.length - 3 &&
            map[i + 3] == map[i + 4] &&
            !map[i + 5].insertLeft
          ) {
            node = map[(i += 3) + 2];
            collapse = "right";
          }
        }
        break;
      }
    }
    return {
      node: node,
      start: start,
      end: end,
      collapse: collapse,
      coverStart: mStart,
      coverEnd: mEnd,
    };
  }

  function getUsefulRect(rects, bias) {
    var rect = nullRect;
    if (bias == "left") {
      for (var i = 0; i < rects.length; i++) {
        if ((rect = rects[i]).left != rect.right) {
          break;
        }
      }
    } else {
      for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
        if ((rect = rects[i$1]).left != rect.right) {
          break;
        }
      }
    }
    return rect;
  }

  function measureCharInner(cm, prepared, ch, bias) {
    var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
    var node = place.node,
      start = place.start,
      end = place.end,
      collapse = place.collapse;

    var rect;
    if (node.nodeType == 3) {
      // If it is a text node, use a range to retrieve the coordinates.
      for (var i$1 = 0; i$1 < 4; i$1++) {
        // Retry a maximum of 4 times when nonsense rectangles are returned
        while (
          start &&
          isExtendingChar(prepared.line.text.charAt(place.coverStart + start))
        ) {
          --start;
        }
        while (
          place.coverStart + end < place.coverEnd &&
          isExtendingChar(prepared.line.text.charAt(place.coverStart + end))
        ) {
          ++end;
        }
        if (
          ie &&
          ie_version < 9 &&
          start == 0 &&
          end == place.coverEnd - place.coverStart
        ) {
          rect = node.parentNode.getBoundingClientRect();
        } else {
          rect = getUsefulRect(range(node, start, end).getClientRects(), bias);
        }
        if (rect.left || rect.right || start == 0) {
          break;
        }
        end = start;
        start = start - 1;
        collapse = "right";
      }
      if (ie && ie_version < 11) {
        rect = maybeUpdateRectForZooming(cm.display.measure, rect);
      }
    } else {
      // If it is a widget, simply get the box for the whole widget.
      if (start > 0) {
        collapse = bias = "right";
      }
      var rects;
      if (
        cm.options.lineWrapping &&
        (rects = node.getClientRects()).length > 1
      ) {
        rect = rects[bias == "right" ? rects.length - 1 : 0];
      } else {
        rect = node.getBoundingClientRect();
      }
    }
    if (
      ie &&
      ie_version < 9 &&
      !start &&
      (!rect || (!rect.left && !rect.right))
    ) {
      var rSpan = node.parentNode.getClientRects()[0];
      if (rSpan) {
        rect = {
          left: rSpan.left,
          right: rSpan.left + charWidth(cm.display),
          top: rSpan.top,
          bottom: rSpan.bottom,
        };
      } else {
        rect = nullRect;
      }
    }

    var rtop = rect.top - prepared.rect.top,
      rbot = rect.bottom - prepared.rect.top;
    var mid = (rtop + rbot) / 2;
    var heights = prepared.view.measure.heights;
    var i = 0;
    for (; i < heights.length - 1; i++) {
      if (mid < heights[i]) {
        break;
      }
    }
    var top = i ? heights[i - 1] : 0,
      bot = heights[i];
    var result = {
      left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
      right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
      top: top,
      bottom: bot,
    };
    if (!rect.left && !rect.right) {
      result.bogus = true;
    }
    if (!cm.options.singleCursorHeightPerLine) {
      result.rtop = rtop;
      result.rbottom = rbot;
    }

    return result;
  }

  // Work around problem with bounding client rects on ranges being
  // returned incorrectly when zoomed on IE10 and below.
  function maybeUpdateRectForZooming(measure, rect) {
    if (
      !window.screen ||
      screen.logicalXDPI == null ||
      screen.logicalXDPI == screen.deviceXDPI ||
      !hasBadZoomedRects(measure)
    ) {
      return rect;
    }
    var scaleX = screen.logicalXDPI / screen.deviceXDPI;
    var scaleY = screen.logicalYDPI / screen.deviceYDPI;
    return {
      left: rect.left * scaleX,
      right: rect.right * scaleX,
      top: rect.top * scaleY,
      bottom: rect.bottom * scaleY,
    };
  }

  function clearLineMeasurementCacheFor(lineView) {
    if (lineView.measure) {
      lineView.measure.cache = {};
      lineView.measure.heights = null;
      if (lineView.rest) {
        for (var i = 0; i < lineView.rest.length; i++) {
          lineView.measure.caches[i] = {};
        }
      }
    }
  }

  function clearLineMeasurementCache(cm) {
    cm.display.externalMeasure = null;
    removeChildren(cm.display.lineMeasure);
    for (var i = 0; i < cm.display.view.length; i++) {
      clearLineMeasurementCacheFor(cm.display.view[i]);
    }
  }

  function clearCaches(cm) {
    clearLineMeasurementCache(cm);
    cm.display.cachedCharWidth =
      cm.display.cachedTextHeight =
      cm.display.cachedPaddingH =
        null;
    if (!cm.options.lineWrapping) {
      cm.display.maxLineChanged = true;
    }
    cm.display.lineNumChars = null;
  }

  function pageScrollX() {
    // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
    // which causes page_Offset and bounding client rects to use
    // different reference viewports and invalidate our calculations.
    if (chrome && android) {
      return -(
        document.body.getBoundingClientRect().left -
        parseInt(getComputedStyle(document.body).marginLeft)
      );
    }
    return (
      window.pageXOffset ||
      (document.documentElement || document.body).scrollLeft
    );
  }
  function pageScrollY() {
    if (chrome && android) {
      return -(
        document.body.getBoundingClientRect().top -
        parseInt(getComputedStyle(document.body).marginTop)
      );
    }
    return (
      window.pageYOffset ||
      (document.documentElement || document.body).scrollTop
    );
  }

  function widgetTopHeight(lineObj) {
    var height = 0;
    if (lineObj.widgets) {
      for (var i = 0; i < lineObj.widgets.length; ++i) {
        if (lineObj.widgets[i].above) {
          height += widgetHeight(lineObj.widgets[i]);
        }
      }
    }
    return height;
  }

  // Converts a {top, bottom, left, right} box from line-local
  // coordinates into another coordinate system. Context may be one of
  // "line", "div" (display.lineDiv), "local"./null (editor), "window",
  // or "page".
  function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
    if (!includeWidgets) {
      var height = widgetTopHeight(lineObj);
      rect.top += height;
      rect.bottom += height;
    }
    if (context == "line") {
      return rect;
    }
    if (!context) {
      context = "local";
    }
    var yOff = heightAtLine(lineObj);
    if (context == "local") {
      yOff += paddingTop(cm.display);
    } else {
      yOff -= cm.display.viewOffset;
    }
    if (context == "page" || context == "window") {
      var lOff = cm.display.lineSpace.getBoundingClientRect();
      yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
      var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
      rect.left += xOff;
      rect.right += xOff;
    }
    rect.top += yOff;
    rect.bottom += yOff;
    return rect;
  }

  // Coverts a box from "div" coords to another coordinate system.
  // Context may be "window", "page", "div", or "local"./null.
  function fromCoordSystem(cm, coords, context) {
    if (context == "div") {
      return coords;
    }
    var left = coords.left,
      top = coords.top;
    // First move into "page" coordinate system
    if (context == "page") {
      left -= pageScrollX();
      top -= pageScrollY();
    } else if (context == "local" || !context) {
      var localBox = cm.display.sizer.getBoundingClientRect();
      left += localBox.left;
      top += localBox.top;
    }

    var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
    return { left: left - lineSpaceBox.left, top: top - lineSpaceBox.top };
  }

  function charCoords(cm, pos, context, lineObj, bias) {
    if (!lineObj) {
      lineObj = getLine(cm.doc, pos.line);
    }
    return intoCoordSystem(
      cm,
      lineObj,
      measureChar(cm, lineObj, pos.ch, bias),
      context
    );
  }

  // Returns a box for a given cursor position, which may have an
  // 'other' property containing the position of the secondary cursor
  // on a bidi boundary.
  // A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
  // and after `char - 1` in writing order of `char - 1`
  // A cursor Pos(line, char, "after") is on the same visual line as `char`
  // and before `char` in writing order of `char`
  // Examples (upper-case letters are RTL, lower-case are LTR):
  //     Pos(0, 1, ...)
  //     before   after
  // ab     a|b     a|b
  // aB     a|B     aB|
  // Ab     |Ab     A|b
  // AB     B|A     B|A
  // Every position after the last character on a line is considered to stick
  // to the last character on the line.
  function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
    lineObj = lineObj || getLine(cm.doc, pos.line);
    if (!preparedMeasure) {
      preparedMeasure = prepareMeasureForLine(cm, lineObj);
    }
    function get(ch, right) {
      var m = measureCharPrepared(
        cm,
        preparedMeasure,
        ch,
        right ? "right" : "left",
        varHeight
      );
      if (right) {
        m.left = m.right;
      } else {
        m.right = m.left;
      }
      return intoCoordSystem(cm, lineObj, m, context);
    }
    var order = getOrder(lineObj, cm.doc.direction),
      ch = pos.ch,
      sticky = pos.sticky;
    if (ch >= lineObj.text.length) {
      ch = lineObj.text.length;
      sticky = "before";
    } else if (ch <= 0) {
      ch = 0;
      sticky = "after";
    }
    if (!order) {
      return get(sticky == "before" ? ch - 1 : ch, sticky == "before");
    }

    function getBidi(ch, partPos, invert) {
      var part = order[partPos],
        right = part.level == 1;
      return get(invert ? ch - 1 : ch, right != invert);
    }
    var partPos = getBidiPartAt(order, ch, sticky);
    var other = bidiOther;
    var val = getBidi(ch, partPos, sticky == "before");
    if (other != null) {
      val.other = getBidi(ch, other, sticky != "before");
    }
    return val;
  }

  // Used to cheaply estimate the coordinates for a position. Used for
  // intermediate scroll updates.
  function estimateCoords(cm, pos) {
    var left = 0;
    pos = clipPos(cm.doc, pos);
    if (!cm.options.lineWrapping) {
      left = charWidth(cm.display) * pos.ch;
    }
    var lineObj = getLine(cm.doc, pos.line);
    var top = heightAtLine(lineObj) + paddingTop(cm.display);
    return { left: left, right: left, top: top, bottom: top + lineObj.height };
  }

  // Positions returned by coordsChar contain some extra information.
  // xRel is the relative x position of the input coordinates compared
  // to the found position (so xRel > 0 means the coordinates are to
  // the right of the character position, for example). When outside
  // is true, that means the coordinates lie outside the line's
  // vertical range.
  function PosWithInfo(line, ch, sticky, outside, xRel) {
    var pos = Pos(line, ch, sticky);
    pos.xRel = xRel;
    if (outside) {
      pos.outside = outside;
    }
    return pos;
  }

  // Compute the character position closest to the given coordinates.
  // Input must be lineSpace-local ("div" coordinate system).
  function coordsChar(cm, x, y) {
    var doc = cm.doc;
    y += cm.display.viewOffset;
    if (y < 0) {
      return PosWithInfo(doc.first, 0, null, -1, -1);
    }
    var lineN = lineAtHeight(doc, y),
      last = doc.first + doc.size - 1;
    if (lineN > last) {
      return PosWithInfo(
        doc.first + doc.size - 1,
        getLine(doc, last).text.length,
        null,
        1,
        1
      );
    }
    if (x < 0) {
      x = 0;
    }

    var lineObj = getLine(doc, lineN);
    for (;;) {
      var found = coordsCharInner(cm, lineObj, lineN, x, y);
      var collapsed = collapsedSpanAround(
        lineObj,
        found.ch + (found.xRel > 0 || found.outside > 0 ? 1 : 0)
      );
      if (!collapsed) {
        return found;
      }
      var rangeEnd = collapsed.find(1);
      if (rangeEnd.line == lineN) {
        return rangeEnd;
      }
      lineObj = getLine(doc, (lineN = rangeEnd.line));
    }
  }

  function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
    y -= widgetTopHeight(lineObj);
    var end = lineObj.text.length;
    var begin = findFirst(
      function (ch) {
        return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y;
      },
      end,
      0
    );
    end = findFirst(
      function (ch) {
        return measureCharPrepared(cm, preparedMeasure, ch).top > y;
      },
      begin,
      end
    );
    return { begin: begin, end: end };
  }

  function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
    if (!preparedMeasure) {
      preparedMeasure = prepareMeasureForLine(cm, lineObj);
    }
    var targetTop = intoCoordSystem(
      cm,
      lineObj,
      measureCharPrepared(cm, preparedMeasure, target),
      "line"
    ).top;
    return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop);
  }

  // Returns true if the given side of a box is after the given
  // coordinates, in top-to-bottom, left-to-right order.
  function boxIsAfter(box, x, y, left) {
    return box.bottom <= y
      ? false
      : box.top > y
      ? true
      : (left ? box.left : box.right) > x;
  }

  function coordsCharInner(cm, lineObj, lineNo, x, y) {
    // Move y into line-local coordinate space
    y -= heightAtLine(lineObj);
    var preparedMeasure = prepareMeasureForLine(cm, lineObj);
    // When directly calling `measureCharPrepared`, we have to adjust
    // for the widgets at this line.
    var widgetHeight = widgetTopHeight(lineObj);
    var begin = 0,
      end = lineObj.text.length,
      ltr = true;

    var order = getOrder(lineObj, cm.doc.direction);
    // If the line isn't plain left-to-right text, first figure out
    // which bidi section the coordinates fall into.
    if (order) {
      var part = (
        cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart
      )(cm, lineObj, lineNo, preparedMeasure, order, x, y);
      ltr = part.level != 1;
      // The awkward -1 offsets are needed because findFirst (called
      // on these below) will treat its first bound as inclusive,
      // second as exclusive, but we want to actually address the
      // characters in the part's range
      begin = ltr ? part.from : part.to - 1;
      end = ltr ? part.to : part.from - 1;
    }

    // A binary search to find the first character whose bounding box
    // starts after the coordinates. If we run across any whose box wrap
    // the coordinates, store that.
    var chAround = null,
      boxAround = null;
    var ch = findFirst(
      function (ch) {
        var box = measureCharPrepared(cm, preparedMeasure, ch);
        box.top += widgetHeight;
        box.bottom += widgetHeight;
        if (!boxIsAfter(box, x, y, false)) {
          return false;
        }
        if (box.top <= y && box.left <= x) {
          chAround = ch;
          boxAround = box;
        }
        return true;
      },
      begin,
      end
    );

    var baseX,
      sticky,
      outside = false;
    // If a box around the coordinates was found, use that
    if (boxAround) {
      // Distinguish coordinates nearer to the left or right side of the box
      var atLeft = x - boxAround.left < boxAround.right - x,
        atStart = atLeft == ltr;
      ch = chAround + (atStart ? 0 : 1);
      sticky = atStart ? "after" : "before";
      baseX = atLeft ? boxAround.left : boxAround.right;
    } else {
      // (Adjust for extended bound, if necessary.)
      if (!ltr && (ch == end || ch == begin)) {
        ch++;
      }
      // To determine which side to associate with, get the box to the
      // left of the character and compare it's vertical position to the
      // coordinates
      sticky =
        ch == 0
          ? "after"
          : ch == lineObj.text.length
          ? "before"
          : measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0))
              .bottom +
              widgetHeight <=
              y ==
            ltr
          ? "after"
          : "before";
      // Now get accurate coordinates for this place, in order to get a
      // base X position
      var coords = cursorCoords(
        cm,
        Pos(lineNo, ch, sticky),
        "line",
        lineObj,
        preparedMeasure
      );
      baseX = coords.left;
      outside = y < coords.top ? -1 : y >= coords.bottom ? 1 : 0;
    }

    ch = skipExtendingChars(lineObj.text, ch, 1);
    return PosWithInfo(lineNo, ch, sticky, outside, x - baseX);
  }

  function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {
    // Bidi parts are sorted left-to-right, and in a non-line-wrapping
    // situation, we can take this ordering to correspond to the visual
    // ordering. This finds the first part whose end is after the given
    // coordinates.
    var index = findFirst(
      function (i) {
        var part = order[i],
          ltr = part.level != 1;
        return boxIsAfter(
          cursorCoords(
            cm,
            Pos(lineNo, ltr ? part.to : part.from, ltr ? "before" : "after"),
            "line",
            lineObj,
            preparedMeasure
          ),
          x,
          y,
          true
        );
      },
      0,
      order.length - 1
    );
    var part = order[index];
    // If this isn't the first part, the part's start is also after
    // the coordinates, and the coordinates aren't on the same line as
    // that start, move one part back.
    if (index > 0) {
      var ltr = part.level != 1;
      var start = cursorCoords(
        cm,
        Pos(lineNo, ltr ? part.from : part.to, ltr ? "after" : "before"),
        "line",
        lineObj,
        preparedMeasure
      );
      if (boxIsAfter(start, x, y, true) && start.top > y) {
        part = order[index - 1];
      }
    }
    return part;
  }

  function coordsBidiPartWrapped(
    cm,
    lineObj,
    _lineNo,
    preparedMeasure,
    order,
    x,
    y
  ) {
    // In a wrapped line, rtl text on wrapping boundaries can do things
    // that don't correspond to the ordering in our `order` array at
    // all, so a binary search doesn't work, and we want to return a
    // part that only spans one line so that the binary search in
    // coordsCharInner is safe. As such, we first find the extent of the
    // wrapped line, and then do a flat search in which we discard any
    // spans that aren't on the line.
    var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);
    var begin = ref.begin;
    var end = ref.end;
    if (/\s/.test(lineObj.text.charAt(end - 1))) {
      end--;
    }
    var part = null,
      closestDist = null;
    for (var i = 0; i < order.length; i++) {
      var p = order[i];
      if (p.from >= end || p.to <= begin) {
        continue;
      }
      var ltr = p.level != 1;
      var endX = measureCharPrepared(
        cm,
        preparedMeasure,
        ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)
      ).right;
      // Weigh against spans ending before this, so that they are only
      // picked if nothing ends after
      var dist = endX < x ? x - endX + 1e9 : endX - x;
      if (!part || closestDist > dist) {
        part = p;
        closestDist = dist;
      }
    }
    if (!part) {
      part = order[order.length - 1];
    }
    // Clip the part to the wrapped line.
    if (part.from < begin) {
      part = { from: begin, to: part.to, level: part.level };
    }
    if (part.to > end) {
      part = { from: part.from, to: end, level: part.level };
    }
    return part;
  }

  var measureText;
  // Compute the default text height.
  function textHeight(display) {
    if (display.cachedTextHeight != null) {
      return display.cachedTextHeight;
    }
    if (measureText == null) {
      measureText = elt("pre", null, "CodeMirror-line-like");
      // Measure a bunch of lines, for browsers that compute
      // fractional heights.
      for (var i = 0; i < 49; ++i) {
        measureText.appendChild(document.createTextNode("x"));
        measureText.appendChild(elt("br"));
      }
      measureText.appendChild(document.createTextNode("x"));
    }
    removeChildrenAndAdd(display.measure, measureText);
    var height = measureText.offsetHeight / 50;
    if (height > 3) {
      display.cachedTextHeight = height;
    }
    removeChildren(display.measure);
    return height || 1;
  }

  // Compute the default character width.
  function charWidth(display) {
    if (display.cachedCharWidth != null) {
      return display.cachedCharWidth;
    }
    var anchor = elt("span", "xxxxxxxxxx");
    var pre = elt("pre", [anchor], "CodeMirror-line-like");
    removeChildrenAndAdd(display.measure, pre);
    var rect = anchor.getBoundingClientRect(),
      width = (rect.right - rect.left) / 10;
    if (width > 2) {
      display.cachedCharWidth = width;
    }
    return width || 10;
  }

  // Do a bulk-read of the DOM positions and sizes needed to draw the
  // view, so that we don't interleave reading and writing to the DOM.
  function getDimensions(cm) {
    var d = cm.display,
      left = {},
      width = {};
    var gutterLeft = d.gutters.clientLeft;
    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
      var id = cm.display.gutterSpecs[i].className;
      left[id] = n.offsetLeft + n.clientLeft + gutterLeft;
      width[id] = n.clientWidth;
    }
    return {
      fixedPos: compensateForHScroll(d),
      gutterTotalWidth: d.gutters.offsetWidth,
      gutterLeft: left,
      gutterWidth: width,
      wrapperWidth: d.wrapper.clientWidth,
    };
  }

  // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
  // but using getBoundingClientRect to get a sub-pixel-accurate
  // result.
  function compensateForHScroll(display) {
    return (
      display.scroller.getBoundingClientRect().left -
      display.sizer.getBoundingClientRect().left
    );
  }

  // Returns a function that estimates the height of a line, to use as
  // first approximation until the line becomes visible (and is thus
  // properly measurable).
  function estimateHeight(cm) {
    var th = textHeight(cm.display),
      wrapping = cm.options.lineWrapping;
    var perLine =
      wrapping &&
      Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
    return function (line) {
      if (lineIsHidden(cm.doc, line)) {
        return 0;
      }

      var widgetsHeight = 0;
      if (line.widgets) {
        for (var i = 0; i < line.widgets.length; i++) {
          if (line.widgets[i].height) {
            widgetsHeight += line.widgets[i].height;
          }
        }
      }

      if (wrapping) {
        return (
          widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th
        );
      } else {
        return widgetsHeight + th;
      }
    };
  }

  function estimateLineHeights(cm) {
    var doc = cm.doc,
      est = estimateHeight(cm);
    doc.iter(function (line) {
      var estHeight = est(line);
      if (estHeight != line.height) {
        updateLineHeight(line, estHeight);
      }
    });
  }

  // Given a mouse event, find the corresponding position. If liberal
  // is false, it checks whether a gutter or scrollbar was clicked,
  // and returns null if it was. forRect is used by rectangular
  // selections, and tries to estimate a character position even for
  // coordinates beyond the right of the text.
  function posFromMouse(cm, e, liberal, forRect) {
    var display = cm.display;
    if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") {
      return null;
    }

    var x,
      y,
      space = display.lineSpace.getBoundingClientRect();
    // Fails unpredictably on IE[67] when mouse is dragged around quickly.
    try {
      x = e.clientX - space.left;
      y = e.clientY - space.top;
    } catch (e$1) {
      return null;
    }
    var coords = coordsChar(cm, x, y),
      line;
    if (
      forRect &&
      coords.xRel > 0 &&
      (line = getLine(cm.doc, coords.line).text).length == coords.ch
    ) {
      var colDiff =
        countColumn(line, line.length, cm.options.tabSize) - line.length;
      coords = Pos(
        coords.line,
        Math.max(
          0,
          Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) -
            colDiff
        )
      );
    }
    return coords;
  }

  // Find the view element corresponding to a given line. Return null
  // when the line isn't visible.
  function findViewIndex(cm, n) {
    if (n >= cm.display.viewTo) {
      return null;
    }
    n -= cm.display.viewFrom;
    if (n < 0) {
      return null;
    }
    var view = cm.display.view;
    for (var i = 0; i < view.length; i++) {
      n -= view[i].size;
      if (n < 0) {
        return i;
      }
    }
  }

  // Updates the display.view data structure for a given change to the
  // document. From and to are in pre-change coordinates. Lendiff is
  // the amount of lines added or subtracted by the change. This is
  // used for changes that span multiple lines, or change the way
  // lines are divided into visual lines. regLineChange (below)
  // registers single-line changes.
  function regChange(cm, from, to, lendiff) {
    if (from == null) {
      from = cm.doc.first;
    }
    if (to == null) {
      to = cm.doc.first + cm.doc.size;
    }
    if (!lendiff) {
      lendiff = 0;
    }

    var display = cm.display;
    if (
      lendiff &&
      to < display.viewTo &&
      (display.updateLineNumbers == null || display.updateLineNumbers > from)
    ) {
      display.updateLineNumbers = from;
    }

    cm.curOp.viewChanged = true;

    if (from >= display.viewTo) {
      // Change after
      if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo) {
        resetView(cm);
      }
    } else if (to <= display.viewFrom) {
      // Change before
      if (
        sawCollapsedSpans &&
        visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom
      ) {
        resetView(cm);
      } else {
        display.viewFrom += lendiff;
        display.viewTo += lendiff;
      }
    } else if (from <= display.viewFrom && to >= display.viewTo) {
      // Full overlap
      resetView(cm);
    } else if (from <= display.viewFrom) {
      // Top overlap
      var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
      if (cut) {
        display.view = display.view.slice(cut.index);
        display.viewFrom = cut.lineN;
        display.viewTo += lendiff;
      } else {
        resetView(cm);
      }
    } else if (to >= display.viewTo) {
      // Bottom overlap
      var cut$1 = viewCuttingPoint(cm, from, from, -1);
      if (cut$1) {
        display.view = display.view.slice(0, cut$1.index);
        display.viewTo = cut$1.lineN;
      } else {
        resetView(cm);
      }
    } else {
      // Gap in the middle
      var cutTop = viewCuttingPoint(cm, from, from, -1);
      var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
      if (cutTop && cutBot) {
        display.view = display.view
          .slice(0, cutTop.index)
          .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
          .concat(display.view.slice(cutBot.index));
        display.viewTo += lendiff;
      } else {
        resetView(cm);
      }
    }

    var ext = display.externalMeasured;
    if (ext) {
      if (to < ext.lineN) {
        ext.lineN += lendiff;
      } else if (from < ext.lineN + ext.size) {
        display.externalMeasured = null;
      }
    }
  }

  // Register a change to a single line. Type must be one of "text",
  // "gutter", "class", "widget"
  function regLineChange(cm, line, type) {
    cm.curOp.viewChanged = true;
    var display = cm.display,
      ext = cm.display.externalMeasured;
    if (ext && line >= ext.lineN && line < ext.lineN + ext.size) {
      display.externalMeasured = null;
    }

    if (line < display.viewFrom || line >= display.viewTo) {
      return;
    }
    var lineView = display.view[findViewIndex(cm, line)];
    if (lineView.node == null) {
      return;
    }
    var arr = lineView.changes || (lineView.changes = []);
    if (indexOf(arr, type) == -1) {
      arr.push(type);
    }
  }

  // Clear the view.
  function resetView(cm) {
    cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
    cm.display.view = [];
    cm.display.viewOffset = 0;
  }

  function viewCuttingPoint(cm, oldN, newN, dir) {
    var index = findViewIndex(cm, oldN),
      diff,
      view = cm.display.view;
    if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size) {
      return { index: index, lineN: newN };
    }
    var n = cm.display.viewFrom;
    for (var i = 0; i < index; i++) {
      n += view[i].size;
    }
    if (n != oldN) {
      if (dir > 0) {
        if (index == view.length - 1) {
          return null;
        }
        diff = n + view[index].size - oldN;
        index++;
      } else {
        diff = n - oldN;
      }
      oldN += diff;
      newN += diff;
    }
    while (visualLineNo(cm.doc, newN) != newN) {
      if (index == (dir < 0 ? 0 : view.length - 1)) {
        return null;
      }
      newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
      index += dir;
    }
    return { index: index, lineN: newN };
  }

  // Force the view to cover a given range, adding empty view element
  // or clipping off existing ones as needed.
  function adjustView(cm, from, to) {
    var display = cm.display,
      view = display.view;
    if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
      display.view = buildViewArray(cm, from, to);
      display.viewFrom = from;
    } else {
      if (display.viewFrom > from) {
        display.view = buildViewArray(cm, from, display.viewFrom).concat(
          display.view
        );
      } else if (display.viewFrom < from) {
        display.view = display.view.slice(findViewIndex(cm, from));
      }
      display.viewFrom = from;
      if (display.viewTo < to) {
        display.view = display.view.concat(
          buildViewArray(cm, display.viewTo, to)
        );
      } else if (display.viewTo > to) {
        display.view = display.view.slice(0, findViewIndex(cm, to));
      }
    }
    display.viewTo = to;
  }

  // Count the number of lines in the view whose DOM representation is
  // out of date (or nonexistent).
  function countDirtyView(cm) {
    var view = cm.display.view,
      dirty = 0;
    for (var i = 0; i < view.length; i++) {
      var lineView = view[i];
      if (!lineView.hidden && (!lineView.node || lineView.changes)) {
        ++dirty;
      }
    }
    return dirty;
  }

  function updateSelection(cm) {
    cm.display.input.showSelection(cm.display.input.prepareSelection());
  }

  function prepareSelection(cm, primary) {
    if (primary === void 0) primary = true;

    var doc = cm.doc,
      result = {};
    var curFragment = (result.cursors = document.createDocumentFragment());
    var selFragment = (result.selection = document.createDocumentFragment());

    for (var i = 0; i < doc.sel.ranges.length; i++) {
      if (!primary && i == doc.sel.primIndex) {
        continue;
      }
      var range = doc.sel.ranges[i];
      if (
        range.from().line >= cm.display.viewTo ||
        range.to().line < cm.display.viewFrom
      ) {
        continue;
      }
      var collapsed = range.empty();
      if (collapsed || cm.options.showCursorWhenSelecting) {
        drawSelectionCursor(cm, range.head, curFragment);
      }
      if (!collapsed) {
        drawSelectionRange(cm, range, selFragment);
      }
    }
    return result;
  }

  // Draws a cursor for the given range
  function drawSelectionCursor(cm, head, output) {
    var pos = cursorCoords(
      cm,
      head,
      "div",
      null,
      null,
      !cm.options.singleCursorHeightPerLine
    );

    var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
    cursor.style.left = pos.left + "px";
    cursor.style.top = pos.top + "px";
    cursor.style.height =
      Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

    if (/\bcm-fat-cursor\b/.test(cm.getWrapperElement().className)) {
      var charPos = charCoords(cm, head, "div", null, null);
      cursor.style.width = Math.max(0, charPos.right - charPos.left) + "px";
    }

    if (pos.other) {
      // Secondary cursor, shown when on a 'jump' in bi-directional text
      var otherCursor = output.appendChild(
        elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor")
      );
      otherCursor.style.display = "";
      otherCursor.style.left = pos.other.left + "px";
      otherCursor.style.top = pos.other.top + "px";
      otherCursor.style.height =
        (pos.other.bottom - pos.other.top) * 0.85 + "px";
    }
  }

  function cmpCoords(a, b) {
    return a.top - b.top || a.left - b.left;
  }

  // Draws the given range as a highlighted selection
  function drawSelectionRange(cm, range, output) {
    var display = cm.display,
      doc = cm.doc;
    var fragment = document.createDocumentFragment();
    var padding = paddingH(cm.display),
      leftSide = padding.left;
    var rightSide =
      Math.max(
        display.sizerWidth,
        displayWidth(cm) - display.sizer.offsetLeft
      ) - padding.right;
    var docLTR = doc.direction == "ltr";

    function add(left, top, width, bottom) {
      if (top < 0) {
        top = 0;
      }
      top = Math.round(top);
      bottom = Math.round(bottom);
      fragment.appendChild(
        elt(
          "div",
          null,
          "CodeMirror-selected",
          "position: absolute; left: " +
            left +
            "px;\n                             top: " +
            top +
            "px; width: " +
            (width == null ? rightSide - left : width) +
            "px;\n                             height: " +
            (bottom - top) +
            "px"
        )
      );
    }

    function drawForLine(line, fromArg, toArg) {
      var lineObj = getLine(doc, line);
      var lineLen = lineObj.text.length;
      var start, end;
      function coords(ch, bias) {
        return charCoords(cm, Pos(line, ch), "div", lineObj, bias);
      }

      function wrapX(pos, dir, side) {
        var extent = wrappedLineExtentChar(cm, lineObj, null, pos);
        var prop = (dir == "ltr") == (side == "after") ? "left" : "right";
        var ch =
          side == "after"
            ? extent.begin
            : extent.end -
              (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);
        return coords(ch, prop)[prop];
      }

      var order = getOrder(lineObj, doc.direction);
      iterateBidiSections(
        order,
        fromArg || 0,
        toArg == null ? lineLen : toArg,
        function (from, to, dir, i) {
          var ltr = dir == "ltr";
          var fromPos = coords(from, ltr ? "left" : "right");
          var toPos = coords(to - 1, ltr ? "right" : "left");

          var openStart = fromArg == null && from == 0,
            openEnd = toArg == null && to == lineLen;
          var first = i == 0,
            last = !order || i == order.length - 1;
          if (toPos.top - fromPos.top <= 3) {
            // Single line
            var openLeft = (docLTR ? openStart : openEnd) && first;
            var openRight = (docLTR ? openEnd : openStart) && last;
            var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;
            var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;
            add(left, fromPos.top, right - left, fromPos.bottom);
          } else {
            // Multiple lines
            var topLeft, topRight, botLeft, botRight;
            if (ltr) {
              topLeft = docLTR && openStart && first ? leftSide : fromPos.left;
              topRight = docLTR ? rightSide : wrapX(from, dir, "before");
              botLeft = docLTR ? leftSide : wrapX(to, dir, "after");
              botRight = docLTR && openEnd && last ? rightSide : toPos.right;
            } else {
              topLeft = !docLTR ? leftSide : wrapX(from, dir, "before");
              topRight =
                !docLTR && openStart && first ? rightSide : fromPos.right;
              botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;
              botRight = !docLTR ? rightSide : wrapX(to, dir, "after");
            }
            add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);
            if (fromPos.bottom < toPos.top) {
              add(leftSide, fromPos.bottom, null, toPos.top);
            }
            add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);
          }

          if (!start || cmpCoords(fromPos, start) < 0) {
            start = fromPos;
          }
          if (cmpCoords(toPos, start) < 0) {
            start = toPos;
          }
          if (!end || cmpCoords(fromPos, end) < 0) {
            end = fromPos;
          }
          if (cmpCoords(toPos, end) < 0) {
            end = toPos;
          }
        }
      );
      return { start: start, end: end };
    }

    var sFrom = range.from(),
      sTo = range.to();
    if (sFrom.line == sTo.line) {
      drawForLine(sFrom.line, sFrom.ch, sTo.ch);
    } else {
      var fromLine = getLine(doc, sFrom.line),
        toLine = getLine(doc, sTo.line);
      var singleVLine = visualLine(fromLine) == visualLine(toLine);
      var leftEnd = drawForLine(
        sFrom.line,
        sFrom.ch,
        singleVLine ? fromLine.text.length + 1 : null
      ).end;
      var rightStart = drawForLine(
        sTo.line,
        singleVLine ? 0 : null,
        sTo.ch
      ).start;
      if (singleVLine) {
        if (leftEnd.top < rightStart.top - 2) {
          add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
          add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
        } else {
          add(
            leftEnd.right,
            leftEnd.top,
            rightStart.left - leftEnd.right,
            leftEnd.bottom
          );
        }
      }
      if (leftEnd.bottom < rightStart.top) {
        add(leftSide, leftEnd.bottom, null, rightStart.top);
      }
    }

    output.appendChild(fragment);
  }

  // Cursor-blinking
  function restartBlink(cm) {
    if (!cm.state.focused) {
      return;
    }
    var display = cm.display;
    clearInterval(display.blinker);
    var on = true;
    display.cursorDiv.style.visibility = "";
    if (cm.options.cursorBlinkRate > 0) {
      display.blinker = setInterval(function () {
        if (!cm.hasFocus()) {
          onBlur(cm);
        }
        display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
      }, cm.options.cursorBlinkRate);
    } else if (cm.options.cursorBlinkRate < 0) {
      display.cursorDiv.style.visibility = "hidden";
    }
  }

  function ensureFocus(cm) {
    if (!cm.hasFocus()) {
      cm.display.input.focus();
      if (!cm.state.focused) {
        onFocus(cm);
      }
    }
  }

  function delayBlurEvent(cm) {
    cm.state.delayingBlurEvent = true;
    setTimeout(function () {
      if (cm.state.delayingBlurEvent) {
        cm.state.delayingBlurEvent = false;
        if (cm.state.focused) {
          onBlur(cm);
        }
      }
    }, 100);
  }

  function onFocus(cm, e) {
    if (cm.state.delayingBlurEvent && !cm.state.draggingText) {
      cm.state.delayingBlurEvent = false;
    }

    if (cm.options.readOnly == "nocursor") {
      return;
    }
    if (!cm.state.focused) {
      signal(cm, "focus", cm, e);
      cm.state.focused = true;
      addClass(cm.display.wrapper, "CodeMirror-focused");
      // This test prevents this from firing when a context
      // menu is closed (since the input reset would kill the
      // select-all detection hack)
      if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
        cm.display.input.reset();
        if (webkit) {
          setTimeout(function () {
            return cm.display.input.reset(true);
          }, 20);
        } // Issue #1730
      }
      cm.display.input.receivedFocus();
    }
    restartBlink(cm);
  }
  function onBlur(cm, e) {
    if (cm.state.delayingBlurEvent) {
      return;
    }

    if (cm.state.focused) {
      signal(cm, "blur", cm, e);
      cm.state.focused = false;
      rmClass(cm.display.wrapper, "CodeMirror-focused");
    }
    clearInterval(cm.display.blinker);
    setTimeout(function () {
      if (!cm.state.focused) {
        cm.display.shift = false;
      }
    }, 150);
  }

  // Read the actual heights of the rendered lines, and update their
  // stored heights to match.
  function updateHeightsInViewport(cm) {
    var display = cm.display;
    var prevBottom = display.lineDiv.offsetTop;
    for (var i = 0; i < display.view.length; i++) {
      var cur = display.view[i],
        wrapping = cm.options.lineWrapping;
      var height = void 0,
        width = 0;
      if (cur.hidden) {
        continue;
      }
      if (ie && ie_version < 8) {
        var bot = cur.node.offsetTop + cur.node.offsetHeight;
        height = bot - prevBottom;
        prevBottom = bot;
      } else {
        var box = cur.node.getBoundingClientRect();
        height = box.bottom - box.top;
        // Check that lines don't extend past the right of the current
        // editor width
        if (!wrapping && cur.text.firstChild) {
          width =
            cur.text.firstChild.getBoundingClientRect().right - box.left - 1;
        }
      }
      var diff = cur.line.height - height;
      if (diff > 0.005 || diff < -0.005) {
        updateLineHeight(cur.line, height);
        updateWidgetHeight(cur.line);
        if (cur.rest) {
          for (var j = 0; j < cur.rest.length; j++) {
            updateWidgetHeight(cur.rest[j]);
          }
        }
      }
      if (width > cm.display.sizerWidth) {
        var chWidth = Math.ceil(width / charWidth(cm.display));
        if (chWidth > cm.display.maxLineLength) {
          cm.display.maxLineLength = chWidth;
          cm.display.maxLine = cur.line;
          cm.display.maxLineChanged = true;
        }
      }
    }
  }

  // Read and store the height of line widgets associated with the
  // given line.
  function updateWidgetHeight(line) {
    if (line.widgets) {
      for (var i = 0; i < line.widgets.length; ++i) {
        var w = line.widgets[i],
          parent = w.node.parentNode;
        if (parent) {
          w.height = parent.offsetHeight;
        }
      }
    }
  }

  // Compute the lines that are visible in a given viewport (defaults
  // the the current scroll position). viewport may contain top,
  // height, and ensure (see op.scrollToPos) properties.
  function visibleLines(display, doc, viewport) {
    var top =
      viewport && viewport.top != null
        ? Math.max(0, viewport.top)
        : display.scroller.scrollTop;
    top = Math.floor(top - paddingTop(display));
    var bottom =
      viewport && viewport.bottom != null
        ? viewport.bottom
        : top + display.wrapper.clientHeight;

    var from = lineAtHeight(doc, top),
      to = lineAtHeight(doc, bottom);
    // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
    // forces those lines into the viewport (if possible).
    if (viewport && viewport.ensure) {
      var ensureFrom = viewport.ensure.from.line,
        ensureTo = viewport.ensure.to.line;
      if (ensureFrom < from) {
        from = ensureFrom;
        to = lineAtHeight(
          doc,
          heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight
        );
      } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
        from = lineAtHeight(
          doc,
          heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight
        );
        to = ensureTo;
      }
    }
    return { from: from, to: Math.max(to, from + 1) };
  }

  // SCROLLING THINGS INTO VIEW

  // If an editor sits on the top or bottom of the window, partially
  // scrolled out of view, this ensures that the cursor is visible.
  function maybeScrollWindow(cm, rect) {
    if (signalDOMEvent(cm, "scrollCursorIntoView")) {
      return;
    }

    var display = cm.display,
      box = display.sizer.getBoundingClientRect(),
      doScroll = null;
    if (rect.top + box.top < 0) {
      doScroll = true;
    } else if (
      rect.bottom + box.top >
      (window.innerHeight || document.documentElement.clientHeight)
    ) {
      doScroll = false;
    }
    if (doScroll != null && !phantom) {
      var scrollNode = elt(
        "div",
        "\u200b",
        null,
        "position: absolute;\n                         top: " +
          (rect.top - display.viewOffset - paddingTop(cm.display)) +
          "px;\n                         height: " +
          (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) +
          "px;\n                         left: " +
          rect.left +
          "px; width: " +
          Math.max(2, rect.right - rect.left) +
          "px;"
      );
      cm.display.lineSpace.appendChild(scrollNode);
      scrollNode.scrollIntoView(doScroll);
      cm.display.lineSpace.removeChild(scrollNode);
    }
  }

  // Scroll a given position into view (immediately), verifying that
  // it actually became visible (as line heights are accurately
  // measured, the position of something may 'drift' during drawing).
  function scrollPosIntoView(cm, pos, end, margin) {
    if (margin == null) {
      margin = 0;
    }
    var rect;
    if (!cm.options.lineWrapping && pos == end) {
      // Set pos and end to the cursor positions around the character pos sticks to
      // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
      // If pos == Pos(_, 0, "before"), pos and end are unchanged
      end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos;
      pos = pos.ch
        ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after")
        : pos;
    }
    for (var limit = 0; limit < 5; limit++) {
      var changed = false;
      var coords = cursorCoords(cm, pos);
      var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
      rect = {
        left: Math.min(coords.left, endCoords.left),
        top: Math.min(coords.top, endCoords.top) - margin,
        right: Math.max(coords.left, endCoords.left),
        bottom: Math.max(coords.bottom, endCoords.bottom) + margin,
      };
      var scrollPos = calculateScrollPos(cm, rect);
      var startTop = cm.doc.scrollTop,
        startLeft = cm.doc.scrollLeft;
      if (scrollPos.scrollTop != null) {
        updateScrollTop(cm, scrollPos.scrollTop);
        if (Math.abs(cm.doc.scrollTop - startTop) > 1) {
          changed = true;
        }
      }
      if (scrollPos.scrollLeft != null) {
        setScrollLeft(cm, scrollPos.scrollLeft);
        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) {
          changed = true;
        }
      }
      if (!changed) {
        break;
      }
    }
    return rect;
  }

  // Scroll a given set of coordinates into view (immediately).
  function scrollIntoView(cm, rect) {
    var scrollPos = calculateScrollPos(cm, rect);
    if (scrollPos.scrollTop != null) {
      updateScrollTop(cm, scrollPos.scrollTop);
    }
    if (scrollPos.scrollLeft != null) {
      setScrollLeft(cm, scrollPos.scrollLeft);
    }
  }

  // Calculate a new scroll position needed to scroll the given
  // rectangle into view. Returns an object with scrollTop and
  // scrollLeft properties. When these are undefined, the
  // vertical/horizontal position does not need to be adjusted.
  function calculateScrollPos(cm, rect) {
    var display = cm.display,
      snapMargin = textHeight(cm.display);
    if (rect.top < 0) {
      rect.top = 0;
    }
    var screentop =
      cm.curOp && cm.curOp.scrollTop != null
        ? cm.curOp.scrollTop
        : display.scroller.scrollTop;
    var screen = displayHeight(cm),
      result = {};
    if (rect.bottom - rect.top > screen) {
      rect.bottom = rect.top + screen;
    }
    var docBottom = cm.doc.height + paddingVert(display);
    var atTop = rect.top < snapMargin,
      atBottom = rect.bottom > docBottom - snapMargin;
    if (rect.top < screentop) {
      result.scrollTop = atTop ? 0 : rect.top;
    } else if (rect.bottom > screentop + screen) {
      var newTop = Math.min(
        rect.top,
        (atBottom ? docBottom : rect.bottom) - screen
      );
      if (newTop != screentop) {
        result.scrollTop = newTop;
      }
    }

    var gutterSpace = cm.options.fixedGutter ? 0 : display.gutters.offsetWidth;
    var screenleft =
      cm.curOp && cm.curOp.scrollLeft != null
        ? cm.curOp.scrollLeft
        : display.scroller.scrollLeft - gutterSpace;
    var screenw = displayWidth(cm) - display.gutters.offsetWidth;
    var tooWide = rect.right - rect.left > screenw;
    if (tooWide) {
      rect.right = rect.left + screenw;
    }
    if (rect.left < 10) {
      result.scrollLeft = 0;
    } else if (rect.left < screenleft) {
      result.scrollLeft = Math.max(
        0,
        rect.left + gutterSpace - (tooWide ? 0 : 10)
      );
    } else if (rect.right > screenw + screenleft - 3) {
      result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw;
    }
    return result;
  }

  // Store a relative adjustment to the scroll position in the current
  // operation (to be applied when the operation finishes).
  function addToScrollTop(cm, top) {
    if (top == null) {
      return;
    }
    resolveScrollToPos(cm);
    cm.curOp.scrollTop =
      (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) +
      top;
  }

  // Make sure that at the end of the operation the current cursor is
  // shown.
  function ensureCursorVisible(cm) {
    resolveScrollToPos(cm);
    var cur = cm.getCursor();
    cm.curOp.scrollToPos = {
      from: cur,
      to: cur,
      margin: cm.options.cursorScrollMargin,
    };
  }

  function scrollToCoords(cm, x, y) {
    if (x != null || y != null) {
      resolveScrollToPos(cm);
    }
    if (x != null) {
      cm.curOp.scrollLeft = x;
    }
    if (y != null) {
      cm.curOp.scrollTop = y;
    }
  }

  function scrollToRange(cm, range) {
    resolveScrollToPos(cm);
    cm.curOp.scrollToPos = range;
  }

  // When an operation has its scrollToPos property set, and another
  // scroll action is applied before the end of the operation, this
  // 'simulates' scrolling that position into view in a cheap way, so
  // that the effect of intermediate scroll commands is not ignored.
  function resolveScrollToPos(cm) {
    var range = cm.curOp.scrollToPos;
    if (range) {
      cm.curOp.scrollToPos = null;
      var from = estimateCoords(cm, range.from),
        to = estimateCoords(cm, range.to);
      scrollToCoordsRange(cm, from, to, range.margin);
    }
  }

  function scrollToCoordsRange(cm, from, to, margin) {
    var sPos = calculateScrollPos(cm, {
      left: Math.min(from.left, to.left),
      top: Math.min(from.top, to.top) - margin,
      right: Math.max(from.right, to.right),
      bottom: Math.max(from.bottom, to.bottom) + margin,
    });
    scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);
  }

  // Sync the scrollable area and scrollbars, ensure the viewport
  // covers the visible area.
  function updateScrollTop(cm, val) {
    if (Math.abs(cm.doc.scrollTop - val) < 2) {
      return;
    }
    if (!gecko) {
      updateDisplaySimple(cm, { top: val });
    }
    setScrollTop(cm, val, true);
    if (gecko) {
      updateDisplaySimple(cm);
    }
    startWorker(cm, 100);
  }

  function setScrollTop(cm, val, forceScroll) {
    val = Math.max(
      0,
      Math.min(
        cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight,
        val
      )
    );
    if (cm.display.scroller.scrollTop == val && !forceScroll) {
      return;
    }
    cm.doc.scrollTop = val;
    cm.display.scrollbars.setScrollTop(val);
    if (cm.display.scroller.scrollTop != val) {
      cm.display.scroller.scrollTop = val;
    }
  }

  // Sync scroller and scrollbar, ensure the gutter elements are
  // aligned.
  function setScrollLeft(cm, val, isScroller, forceScroll) {
    val = Math.max(
      0,
      Math.min(
        val,
        cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth
      )
    );
    if (
      (isScroller
        ? val == cm.doc.scrollLeft
        : Math.abs(cm.doc.scrollLeft - val) < 2) &&
      !forceScroll
    ) {
      return;
    }
    cm.doc.scrollLeft = val;
    alignHorizontally(cm);
    if (cm.display.scroller.scrollLeft != val) {
      cm.display.scroller.scrollLeft = val;
    }
    cm.display.scrollbars.setScrollLeft(val);
  }

  // SCROLLBARS

  // Prepare DOM reads needed to update the scrollbars. Done in one
  // shot to minimize update/measure roundtrips.
  function measureForScrollbars(cm) {
    var d = cm.display,
      gutterW = d.gutters.offsetWidth;
    var docH = Math.round(cm.doc.height + paddingVert(cm.display));
    return {
      clientHeight: d.scroller.clientHeight,
      viewHeight: d.wrapper.clientHeight,
      scrollWidth: d.scroller.scrollWidth,
      clientWidth: d.scroller.clientWidth,
      viewWidth: d.wrapper.clientWidth,
      barLeft: cm.options.fixedGutter ? gutterW : 0,
      docHeight: docH,
      scrollHeight: docH + scrollGap(cm) + d.barHeight,
      nativeBarWidth: d.nativeBarWidth,
      gutterWidth: gutterW,
    };
  }

  var NativeScrollbars = function (place, scroll, cm) {
    this.cm = cm;
    var vert = (this.vert = elt(
      "div",
      [elt("div", null, null, "min-width: 1px")],
      "CodeMirror-vscrollbar"
    ));
    var horiz = (this.horiz = elt(
      "div",
      [elt("div", null, null, "height: 100%; min-height: 1px")],
      "CodeMirror-hscrollbar"
    ));
    vert.tabIndex = horiz.tabIndex = -1;
    place(vert);
    place(horiz);

    on(vert, "scroll", function () {
      if (vert.clientHeight) {
        scroll(vert.scrollTop, "vertical");
      }
    });
    on(horiz, "scroll", function () {
      if (horiz.clientWidth) {
        scroll(horiz.scrollLeft, "horizontal");
      }
    });

    this.checkedZeroWidth = false;
    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
    if (ie && ie_version < 8) {
      this.horiz.style.minHeight = this.vert.style.minWidth = "18px";
    }
  };

  NativeScrollbars.prototype.update = function (measure) {
    var needsH = measure.scrollWidth > measure.clientWidth + 1;
    var needsV = measure.scrollHeight > measure.clientHeight + 1;
    var sWidth = measure.nativeBarWidth;

    if (needsV) {
      this.vert.style.display = "block";
      this.vert.style.bottom = needsH ? sWidth + "px" : "0";
      var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
      // A bug in IE8 can cause this value to be negative, so guard it.
      this.vert.firstChild.style.height =
        Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) +
        "px";
    } else {
      this.vert.style.display = "";
      this.vert.firstChild.style.height = "0";
    }

    if (needsH) {
      this.horiz.style.display = "block";
      this.horiz.style.right = needsV ? sWidth + "px" : "0";
      this.horiz.style.left = measure.barLeft + "px";
      var totalWidth =
        measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
      this.horiz.firstChild.style.width =
        Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) +
        "px";
    } else {
      this.horiz.style.display = "";
      this.horiz.firstChild.style.width = "0";
    }

    if (!this.checkedZeroWidth && measure.clientHeight > 0) {
      if (sWidth == 0) {
        this.zeroWidthHack();
      }
      this.checkedZeroWidth = true;
    }

    return { right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0 };
  };

  NativeScrollbars.prototype.setScrollLeft = function (pos) {
    if (this.horiz.scrollLeft != pos) {
      this.horiz.scrollLeft = pos;
    }
    if (this.disableHoriz) {
      this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz");
    }
  };

  NativeScrollbars.prototype.setScrollTop = function (pos) {
    if (this.vert.scrollTop != pos) {
      this.vert.scrollTop = pos;
    }
    if (this.disableVert) {
      this.enableZeroWidthBar(this.vert, this.disableVert, "vert");
    }
  };

  NativeScrollbars.prototype.zeroWidthHack = function () {
    var w = mac && !mac_geMountainLion ? "12px" : "18px";
    this.horiz.style.height = this.vert.style.width = w;
    this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none";
    this.disableHoriz = new Delayed();
    this.disableVert = new Delayed();
  };

  NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {
    bar.style.pointerEvents = "auto";
    function maybeDisable() {
      // To find out whether the scrollbar is still visible, we
      // check whether the element under the pixel in the bottom
      // right corner of the scrollbar box is the scrollbar box
      // itself (when the bar is still visible) or its filler child
      // (when the bar is hidden). If it is still visible, we keep
      // it enabled, if it's hidden, we disable pointer events.
      var box = bar.getBoundingClientRect();
      var elt =
        type == "vert"
          ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
          : document.elementFromPoint(
              (box.right + box.left) / 2,
              box.bottom - 1
            );
      if (elt != bar) {
        bar.style.pointerEvents = "none";
      } else {
        delay.set(1000, maybeDisable);
      }
    }
    delay.set(1000, maybeDisable);
  };

  NativeScrollbars.prototype.clear = function () {
    var parent = this.horiz.parentNode;
    parent.removeChild(this.horiz);
    parent.removeChild(this.vert);
  };

  var NullScrollbars = function () {};

  NullScrollbars.prototype.update = function () {
    return { bottom: 0, right: 0 };
  };
  NullScrollbars.prototype.setScrollLeft = function () {};
  NullScrollbars.prototype.setScrollTop = function () {};
  NullScrollbars.prototype.clear = function () {};

  function updateScrollbars(cm, measure) {
    if (!measure) {
      measure = measureForScrollbars(cm);
    }
    var startWidth = cm.display.barWidth,
      startHeight = cm.display.barHeight;
    updateScrollbarsInner(cm, measure);
    for (
      var i = 0;
      (i < 4 && startWidth != cm.display.barWidth) ||
      startHeight != cm.display.barHeight;
      i++
    ) {
      if (startWidth != cm.display.barWidth && cm.options.lineWrapping) {
        updateHeightsInViewport(cm);
      }
      updateScrollbarsInner(cm, measureForScrollbars(cm));
      startWidth = cm.display.barWidth;
      startHeight = cm.display.barHeight;
    }
  }

  // Re-synchronize the fake scrollbars with the actual size of the
  // content.
  function updateScrollbarsInner(cm, measure) {
    var d = cm.display;
    var sizes = d.scrollbars.update(measure);

    d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
    d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
    d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent";

    if (sizes.right && sizes.bottom) {
      d.scrollbarFiller.style.display = "block";
      d.scrollbarFiller.style.height = sizes.bottom + "px";
      d.scrollbarFiller.style.width = sizes.right + "px";
    } else {
      d.scrollbarFiller.style.display = "";
    }
    if (
      sizes.bottom &&
      cm.options.coverGutterNextToScrollbar &&
      cm.options.fixedGutter
    ) {
      d.gutterFiller.style.display = "block";
      d.gutterFiller.style.height = sizes.bottom + "px";
      d.gutterFiller.style.width = measure.gutterWidth + "px";
    } else {
      d.gutterFiller.style.display = "";
    }
  }

  var scrollbarModel = { native: NativeScrollbars, null: NullScrollbars };

  function initScrollbars(cm) {
    if (cm.display.scrollbars) {
      cm.display.scrollbars.clear();
      if (cm.display.scrollbars.addClass) {
        rmClass(cm.display.wrapper, cm.display.scrollbars.addClass);
      }
    }

    cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](
      function (node) {
        cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
        // Prevent clicks in the scrollbars from killing focus
        on(node, "mousedown", function () {
          if (cm.state.focused) {
            setTimeout(function () {
              return cm.display.input.focus();
            }, 0);
          }
        });
        node.setAttribute("cm-not-content", "true");
      },
      function (pos, axis) {
        if (axis == "horizontal") {
          setScrollLeft(cm, pos);
        } else {
          updateScrollTop(cm, pos);
        }
      },
      cm
    );
    if (cm.display.scrollbars.addClass) {
      addClass(cm.display.wrapper, cm.display.scrollbars.addClass);
    }
  }

  // Operations are used to wrap a series of changes to the editor
  // state in such a way that each change won't have to update the
  // cursor and display (which would be awkward, slow, and
  // error-prone). Instead, display updates are batched and then all
  // combined and executed at once.

  var nextOpId = 0;
  // Start a new operation.
  function startOperation(cm) {
    cm.curOp = {
      cm: cm,
      viewChanged: false, // Flag that indicates that lines might need to be redrawn
      startHeight: cm.doc.height, // Used to detect need to update scrollbar
      forceUpdate: false, // Used to force a redraw
      updateInput: 0, // Whether to reset the input textarea
      typing: false, // Whether this reset should be careful to leave existing text (for compositing)
      changeObjs: null, // Accumulated changes, for firing change events
      cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
      cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
      selectionChanged: false, // Whether the selection needs to be redrawn
      updateMaxLine: false, // Set when the widest line needs to be determined anew
      scrollLeft: null,
      scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
      scrollToPos: null, // Used to scroll to a specific position
      focus: false,
      id: ++nextOpId, // Unique ID
      markArrays: null, // Used by addMarkedSpan
    };
    pushOperation(cm.curOp);
  }

  // Finish an operation, updating the display and signalling delayed events
  function endOperation(cm) {
    var op = cm.curOp;
    if (op) {
      finishOperation(op, function (group) {
        for (var i = 0; i < group.ops.length; i++) {
          group.ops[i].cm.curOp = null;
        }
        endOperations(group);
      });
    }
  }

  // The DOM updates done when an operation finishes are batched so
  // that the minimum number of relayouts are required.
  function endOperations(group) {
    var ops = group.ops;
    for (
      var i = 0;
      i < ops.length;
      i++ // Read DOM
    ) {
      endOperation_R1(ops[i]);
    }
    for (
      var i$1 = 0;
      i$1 < ops.length;
      i$1++ // Write DOM (maybe)
    ) {
      endOperation_W1(ops[i$1]);
    }
    for (
      var i$2 = 0;
      i$2 < ops.length;
      i$2++ // Read DOM
    ) {
      endOperation_R2(ops[i$2]);
    }
    for (
      var i$3 = 0;
      i$3 < ops.length;
      i$3++ // Write DOM (maybe)
    ) {
      endOperation_W2(ops[i$3]);
    }
    for (
      var i$4 = 0;
      i$4 < ops.length;
      i$4++ // Read DOM
    ) {
      endOperation_finish(ops[i$4]);
    }
  }

  function endOperation_R1(op) {
    var cm = op.cm,
      display = cm.display;
    maybeClipScrollbars(cm);
    if (op.updateMaxLine) {
      findMaxLine(cm);
    }

    op.mustUpdate =
      op.viewChanged ||
      op.forceUpdate ||
      op.scrollTop != null ||
      (op.scrollToPos &&
        (op.scrollToPos.from.line < display.viewFrom ||
          op.scrollToPos.to.line >= display.viewTo)) ||
      (display.maxLineChanged && cm.options.lineWrapping);
    op.update =
      op.mustUpdate &&
      new DisplayUpdate(
        cm,
        op.mustUpdate && { top: op.scrollTop, ensure: op.scrollToPos },
        op.forceUpdate
      );
  }

  function endOperation_W1(op) {
    op.updatedDisplay =
      op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
  }

  function endOperation_R2(op) {
    var cm = op.cm,
      display = cm.display;
    if (op.updatedDisplay) {
      updateHeightsInViewport(cm);
    }

    op.barMeasure = measureForScrollbars(cm);

    // If the max line changed since it was last measured, measure it,
    // and ensure the document's width matches it.
    // updateDisplay_W2 will use these properties to do the actual resizing
    if (display.maxLineChanged && !cm.options.lineWrapping) {
      op.adjustWidthTo =
        measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
      cm.display.sizerWidth = op.adjustWidthTo;
      op.barMeasure.scrollWidth = Math.max(
        display.scroller.clientWidth,
        display.sizer.offsetLeft +
          op.adjustWidthTo +
          scrollGap(cm) +
          cm.display.barWidth
      );
      op.maxScrollLeft = Math.max(
        0,
        display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm)
      );
    }

    if (op.updatedDisplay || op.selectionChanged) {
      op.preparedSelection = display.input.prepareSelection();
    }
  }

  function endOperation_W2(op) {
    var cm = op.cm;

    if (op.adjustWidthTo != null) {
      cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
      if (op.maxScrollLeft < cm.doc.scrollLeft) {
        setScrollLeft(
          cm,
          Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft),
          true
        );
      }
      cm.display.maxLineChanged = false;
    }

    var takeFocus = op.focus && op.focus == activeElt();
    if (op.preparedSelection) {
      cm.display.input.showSelection(op.preparedSelection, takeFocus);
    }
    if (op.updatedDisplay || op.startHeight != cm.doc.height) {
      updateScrollbars(cm, op.barMeasure);
    }
    if (op.updatedDisplay) {
      setDocumentHeight(cm, op.barMeasure);
    }

    if (op.selectionChanged) {
      restartBlink(cm);
    }

    if (cm.state.focused && op.updateInput) {
      cm.display.input.reset(op.typing);
    }
    if (takeFocus) {
      ensureFocus(op.cm);
    }
  }

  function endOperation_finish(op) {
    var cm = op.cm,
      display = cm.display,
      doc = cm.doc;

    if (op.updatedDisplay) {
      postUpdateDisplay(cm, op.update);
    }

    // Abort mouse wheel delta measurement, when scrolling explicitly
    if (
      display.wheelStartX != null &&
      (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos)
    ) {
      display.wheelStartX = display.wheelStartY = null;
    }

    // Propagate the scroll position to the actual DOM scroller
    if (op.scrollTop != null) {
      setScrollTop(cm, op.scrollTop, op.forceScroll);
    }

    if (op.scrollLeft != null) {
      setScrollLeft(cm, op.scrollLeft, true, true);
    }
    // If we need to scroll a specific position into view, do so.
    if (op.scrollToPos) {
      var rect = scrollPosIntoView(
        cm,
        clipPos(doc, op.scrollToPos.from),
        clipPos(doc, op.scrollToPos.to),
        op.scrollToPos.margin
      );
      maybeScrollWindow(cm, rect);
    }

    // Fire events for markers that are hidden/unidden by editing or
    // undoing
    var hidden = op.maybeHiddenMarkers,
      unhidden = op.maybeUnhiddenMarkers;
    if (hidden) {
      for (var i = 0; i < hidden.length; ++i) {
        if (!hidden[i].lines.length) {
          signal(hidden[i], "hide");
        }
      }
    }
    if (unhidden) {
      for (var i$1 = 0; i$1 < unhidden.length; ++i$1) {
        if (unhidden[i$1].lines.length) {
          signal(unhidden[i$1], "unhide");
        }
      }
    }

    if (display.wrapper.offsetHeight) {
      doc.scrollTop = cm.display.scroller.scrollTop;
    }

    // Fire change events, and delayed event handlers
    if (op.changeObjs) {
      signal(cm, "changes", cm, op.changeObjs);
    }
    if (op.update) {
      op.update.finish();
    }
  }

  // Run the given function in an operation
  function runInOp(cm, f) {
    if (cm.curOp) {
      return f();
    }
    startOperation(cm);
    try {
      return f();
    } finally {
      endOperation(cm);
    }
  }
  // Wraps a function in an operation. Returns the wrapped function.
  function operation(cm, f) {
    return function () {
      if (cm.curOp) {
        return f.apply(cm, arguments);
      }
      startOperation(cm);
      try {
        return f.apply(cm, arguments);
      } finally {
        endOperation(cm);
      }
    };
  }
  // Used to add methods to editor and doc instances, wrapping them in
  // operations.
  function methodOp(f) {
    return function () {
      if (this.curOp) {
        return f.apply(this, arguments);
      }
      startOperation(this);
      try {
        return f.apply(this, arguments);
      } finally {
        endOperation(this);
      }
    };
  }
  function docMethodOp(f) {
    return function () {
      var cm = this.cm;
      if (!cm || cm.curOp) {
        return f.apply(this, arguments);
      }
      startOperation(cm);
      try {
        return f.apply(this, arguments);
      } finally {
        endOperation(cm);
      }
    };
  }

  // HIGHLIGHT WORKER

  function startWorker(cm, time) {
    if (cm.doc.highlightFrontier < cm.display.viewTo) {
      cm.state.highlight.set(time, bind(highlightWorker, cm));
    }
  }

  function highlightWorker(cm) {
    var doc = cm.doc;
    if (doc.highlightFrontier >= cm.display.viewTo) {
      return;
    }
    var end = +new Date() + cm.options.workTime;
    var context = getContextBefore(cm, doc.highlightFrontier);
    var changedLines = [];

    doc.iter(
      context.line,
      Math.min(doc.first + doc.size, cm.display.viewTo + 500),
      function (line) {
        if (context.line >= cm.display.viewFrom) {
          // Visible
          var oldStyles = line.styles;
          var resetState =
            line.text.length > cm.options.maxHighlightLength
              ? copyState(doc.mode, context.state)
              : null;
          var highlighted = highlightLine(cm, line, context, true);
          if (resetState) {
            context.state = resetState;
          }
          line.styles = highlighted.styles;
          var oldCls = line.styleClasses,
            newCls = highlighted.classes;
          if (newCls) {
            line.styleClasses = newCls;
          } else if (oldCls) {
            line.styleClasses = null;
          }
          var ischange =
            !oldStyles ||
            oldStyles.length != line.styles.length ||
            (oldCls != newCls &&
              (!oldCls ||
                !newCls ||
                oldCls.bgClass != newCls.bgClass ||
                oldCls.textClass != newCls.textClass));
          for (var i = 0; !ischange && i < oldStyles.length; ++i) {
            ischange = oldStyles[i] != line.styles[i];
          }
          if (ischange) {
            changedLines.push(context.line);
          }
          line.stateAfter = context.save();
          context.nextLine();
        } else {
          if (line.text.length <= cm.options.maxHighlightLength) {
            processLine(cm, line.text, context);
          }
          line.stateAfter = context.line % 5 == 0 ? context.save() : null;
          context.nextLine();
        }
        if (+new Date() > end) {
          startWorker(cm, cm.options.workDelay);
          return true;
        }
      }
    );
    doc.highlightFrontier = context.line;
    doc.modeFrontier = Math.max(doc.modeFrontier, context.line);
    if (changedLines.length) {
      runInOp(cm, function () {
        for (var i = 0; i < changedLines.length; i++) {
          regLineChange(cm, changedLines[i], "text");
        }
      });
    }
  }

  // DISPLAY DRAWING

  var DisplayUpdate = function (cm, viewport, force) {
    var display = cm.display;

    this.viewport = viewport;
    // Store some values that we'll need later (but don't want to force a relayout for)
    this.visible = visibleLines(display, cm.doc, viewport);
    this.editorIsHidden = !display.wrapper.offsetWidth;
    this.wrapperHeight = display.wrapper.clientHeight;
    this.wrapperWidth = display.wrapper.clientWidth;
    this.oldDisplayWidth = displayWidth(cm);
    this.force = force;
    this.dims = getDimensions(cm);
    this.events = [];
  };

  DisplayUpdate.prototype.signal = function (emitter, type) {
    if (hasHandler(emitter, type)) {
      this.events.push(arguments);
    }
  };
  DisplayUpdate.prototype.finish = function () {
    for (var i = 0; i < this.events.length; i++) {
      signal.apply(null, this.events[i]);
    }
  };

  function maybeClipScrollbars(cm) {
    var display = cm.display;
    if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
      display.nativeBarWidth =
        display.scroller.offsetWidth - display.scroller.clientWidth;
      display.heightForcer.style.height = scrollGap(cm) + "px";
      display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
      display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
      display.scrollbarsClipped = true;
    }
  }

  function selectionSnapshot(cm) {
    if (cm.hasFocus()) {
      return null;
    }
    var active = activeElt();
    if (!active || !contains(cm.display.lineDiv, active)) {
      return null;
    }
    var result = { activeElt: active };
    if (window.getSelection) {
      var sel = window.getSelection();
      if (
        sel.anchorNode &&
        sel.extend &&
        contains(cm.display.lineDiv, sel.anchorNode)
      ) {
        result.anchorNode = sel.anchorNode;
        result.anchorOffset = sel.anchorOffset;
        result.focusNode = sel.focusNode;
        result.focusOffset = sel.focusOffset;
      }
    }
    return result;
  }

  function restoreSelection(snapshot) {
    if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) {
      return;
    }
    snapshot.activeElt.focus();
    if (
      !/^(INPUT|TEXTAREA)$/.test(snapshot.activeElt.nodeName) &&
      snapshot.anchorNode &&
      contains(document.body, snapshot.anchorNode) &&
      contains(document.body, snapshot.focusNode)
    ) {
      var sel = window.getSelection(),
        range = document.createRange();
      range.setEnd(snapshot.anchorNode, snapshot.anchorOffset);
      range.collapse(false);
      sel.removeAllRanges();
      sel.addRange(range);
      sel.extend(snapshot.focusNode, snapshot.focusOffset);
    }
  }

  // Does the actual updating of the line display. Bails out
  // (returning false) when there is nothing to be done and forced is
  // false.
  function updateDisplayIfNeeded(cm, update) {
    var display = cm.display,
      doc = cm.doc;

    if (update.editorIsHidden) {
      resetView(cm);
      return false;
    }

    // Bail out if the visible area is already rendered and nothing changed.
    if (
      !update.force &&
      update.visible.from >= display.viewFrom &&
      update.visible.to <= display.viewTo &&
      (display.updateLineNumbers == null ||
        display.updateLineNumbers >= display.viewTo) &&
      display.renderedView == display.view &&
      countDirtyView(cm) == 0
    ) {
      return false;
    }

    if (maybeUpdateLineNumberWidth(cm)) {
      resetView(cm);
      update.dims = getDimensions(cm);
    }

    // Compute a suitable new viewport (from & to)
    var end = doc.first + doc.size;
    var from = Math.max(
      update.visible.from - cm.options.viewportMargin,
      doc.first
    );
    var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
    if (display.viewFrom < from && from - display.viewFrom < 20) {
      from = Math.max(doc.first, display.viewFrom);
    }
    if (display.viewTo > to && display.viewTo - to < 20) {
      to = Math.min(end, display.viewTo);
    }
    if (sawCollapsedSpans) {
      from = visualLineNo(cm.doc, from);
      to = visualLineEndNo(cm.doc, to);
    }

    var different =
      from != display.viewFrom ||
      to != display.viewTo ||
      display.lastWrapHeight != update.wrapperHeight ||
      display.lastWrapWidth != update.wrapperWidth;
    adjustView(cm, from, to);

    display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
    // Position the mover div to align with the current scroll position
    cm.display.mover.style.top = display.viewOffset + "px";

    var toUpdate = countDirtyView(cm);
    if (
      !different &&
      toUpdate == 0 &&
      !update.force &&
      display.renderedView == display.view &&
      (display.updateLineNumbers == null ||
        display.updateLineNumbers >= display.viewTo)
    ) {
      return false;
    }

    // For big changes, we hide the enclosing element during the
    // update, since that speeds up the operations on most browsers.
    var selSnapshot = selectionSnapshot(cm);
    if (toUpdate > 4) {
      display.lineDiv.style.display = "none";
    }
    patchDisplay(cm, display.updateLineNumbers, update.dims);
    if (toUpdate > 4) {
      display.lineDiv.style.display = "";
    }
    display.renderedView = display.view;
    // There might have been a widget with a focused element that got
    // hidden or updated, if so re-focus it.
    restoreSelection(selSnapshot);

    // Prevent selection and cursors from interfering with the scroll
    // width and height.
    removeChildren(display.cursorDiv);
    removeChildren(display.selectionDiv);
    display.gutters.style.height = display.sizer.style.minHeight = 0;

    if (different) {
      display.lastWrapHeight = update.wrapperHeight;
      display.lastWrapWidth = update.wrapperWidth;
      startWorker(cm, 400);
    }

    display.updateLineNumbers = null;

    return true;
  }

  function postUpdateDisplay(cm, update) {
    var viewport = update.viewport;

    for (var first = true; ; first = false) {
      if (
        !first ||
        !cm.options.lineWrapping ||
        update.oldDisplayWidth == displayWidth(cm)
      ) {
        // Clip forced viewport to actual scrollable area.
        if (viewport && viewport.top != null) {
          viewport = {
            top: Math.min(
              cm.doc.height + paddingVert(cm.display) - displayHeight(cm),
              viewport.top
            ),
          };
        }
        // Updated line heights might result in the drawn area not
        // actually covering the viewport. Keep looping until it does.
        update.visible = visibleLines(cm.display, cm.doc, viewport);
        if (
          update.visible.from >= cm.display.viewFrom &&
          update.visible.to <= cm.display.viewTo
        ) {
          break;
        }
      } else if (first) {
        update.visible = visibleLines(cm.display, cm.doc, viewport);
      }
      if (!updateDisplayIfNeeded(cm, update)) {
        break;
      }
      updateHeightsInViewport(cm);
      var barMeasure = measureForScrollbars(cm);
      updateSelection(cm);
      updateScrollbars(cm, barMeasure);
      setDocumentHeight(cm, barMeasure);
      update.force = false;
    }

    update.signal(cm, "update", cm);
    if (
      cm.display.viewFrom != cm.display.reportedViewFrom ||
      cm.display.viewTo != cm.display.reportedViewTo
    ) {
      update.signal(
        cm,
        "viewportChange",
        cm,
        cm.display.viewFrom,
        cm.display.viewTo
      );
      cm.display.reportedViewFrom = cm.display.viewFrom;
      cm.display.reportedViewTo = cm.display.viewTo;
    }
  }

  function updateDisplaySimple(cm, viewport) {
    var update = new DisplayUpdate(cm, viewport);
    if (updateDisplayIfNeeded(cm, update)) {
      updateHeightsInViewport(cm);
      postUpdateDisplay(cm, update);
      var barMeasure = measureForScrollbars(cm);
      updateSelection(cm);
      updateScrollbars(cm, barMeasure);
      setDocumentHeight(cm, barMeasure);
      update.finish();
    }
  }

  // Sync the actual display DOM structure with display.view, removing
  // nodes for lines that are no longer in view, and creating the ones
  // that are not there yet, and updating the ones that are out of
  // date.
  function patchDisplay(cm, updateNumbersFrom, dims) {
    var display = cm.display,
      lineNumbers = cm.options.lineNumbers;
    var container = display.lineDiv,
      cur = container.firstChild;

    function rm(node) {
      var next = node.nextSibling;
      // Works around a throw-scroll bug in OS X Webkit
      if (webkit && mac && cm.display.currentWheelTarget == node) {
        node.style.display = "none";
      } else {
        node.parentNode.removeChild(node);
      }
      return next;
    }

    var view = display.view,
      lineN = display.viewFrom;
    // Loop over the elements in the view, syncing cur (the DOM nodes
    // in display.lineDiv) with the view as we go.
    for (var i = 0; i < view.length; i++) {
      var lineView = view[i];
      if (lineView.hidden);
      else if (!lineView.node || lineView.node.parentNode != container) {
        // Not drawn yet
        var node = buildLineElement(cm, lineView, lineN, dims);
        container.insertBefore(node, cur);
      } else {
        // Already drawn
        while (cur != lineView.node) {
          cur = rm(cur);
        }
        var updateNumber =
          lineNumbers &&
          updateNumbersFrom != null &&
          updateNumbersFrom <= lineN &&
          lineView.lineNumber;
        if (lineView.changes) {
          if (indexOf(lineView.changes, "gutter") > -1) {
            updateNumber = false;
          }
          updateLineForChanges(cm, lineView, lineN, dims);
        }
        if (updateNumber) {
          removeChildren(lineView.lineNumber);
          lineView.lineNumber.appendChild(
            document.createTextNode(lineNumberFor(cm.options, lineN))
          );
        }
        cur = lineView.node.nextSibling;
      }
      lineN += lineView.size;
    }
    while (cur) {
      cur = rm(cur);
    }
  }

  function updateGutterSpace(display) {
    var width = display.gutters.offsetWidth;
    display.sizer.style.marginLeft = width + "px";
    // Send an event to consumers responding to changes in gutter width.
    signalLater(display, "gutterChanged", display);
  }

  function setDocumentHeight(cm, measure) {
    cm.display.sizer.style.minHeight = measure.docHeight + "px";
    cm.display.heightForcer.style.top = measure.docHeight + "px";
    cm.display.gutters.style.height =
      measure.docHeight + cm.display.barHeight + scrollGap(cm) + "px";
  }

  // Re-align line numbers and gutter marks to compensate for
  // horizontal scrolling.
  function alignHorizontally(cm) {
    var display = cm.display,
      view = display.view;
    if (
      !display.alignWidgets &&
      (!display.gutters.firstChild || !cm.options.fixedGutter)
    ) {
      return;
    }
    var comp =
      compensateForHScroll(display) -
      display.scroller.scrollLeft +
      cm.doc.scrollLeft;
    var gutterW = display.gutters.offsetWidth,
      left = comp + "px";
    for (var i = 0; i < view.length; i++) {
      if (!view[i].hidden) {
        if (cm.options.fixedGutter) {
          if (view[i].gutter) {
            view[i].gutter.style.left = left;
          }
          if (view[i].gutterBackground) {
            view[i].gutterBackground.style.left = left;
          }
        }
        var align = view[i].alignable;
        if (align) {
          for (var j = 0; j < align.length; j++) {
            align[j].style.left = left;
          }
        }
      }
    }
    if (cm.options.fixedGutter) {
      display.gutters.style.left = comp + gutterW + "px";
    }
  }

  // Used to ensure that the line number gutter is still the right
  // size for the current document size. Returns true when an update
  // is needed.
  function maybeUpdateLineNumberWidth(cm) {
    if (!cm.options.lineNumbers) {
      return false;
    }
    var doc = cm.doc,
      last = lineNumberFor(cm.options, doc.first + doc.size - 1),
      display = cm.display;
    if (last.length != display.lineNumChars) {
      var test = display.measure.appendChild(
        elt(
          "div",
          [elt("div", last)],
          "CodeMirror-linenumber CodeMirror-gutter-elt"
        )
      );
      var innerW = test.firstChild.offsetWidth,
        padding = test.offsetWidth - innerW;
      display.lineGutter.style.width = "";
      display.lineNumInnerWidth =
        Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
      display.lineNumWidth = display.lineNumInnerWidth + padding;
      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
      display.lineGutter.style.width = display.lineNumWidth + "px";
      updateGutterSpace(cm.display);
      return true;
    }
    return false;
  }

  function getGutters(gutters, lineNumbers) {
    var result = [],
      sawLineNumbers = false;
    for (var i = 0; i < gutters.length; i++) {
      var name = gutters[i],
        style = null;
      if (typeof name != "string") {
        style = name.style;
        name = name.className;
      }
      if (name == "CodeMirror-linenumbers") {
        if (!lineNumbers) {
          continue;
        } else {
          sawLineNumbers = true;
        }
      }
      result.push({ className: name, style: style });
    }
    if (lineNumbers && !sawLineNumbers) {
      result.push({ className: "CodeMirror-linenumbers", style: null });
    }
    return result;
  }

  // Rebuild the gutter elements, ensure the margin to the left of the
  // code matches their width.
  function renderGutters(display) {
    var gutters = display.gutters,
      specs = display.gutterSpecs;
    removeChildren(gutters);
    display.lineGutter = null;
    for (var i = 0; i < specs.length; ++i) {
      var ref = specs[i];
      var className = ref.className;
      var style = ref.style;
      var gElt = gutters.appendChild(
        elt("div", null, "CodeMirror-gutter " + className)
      );
      if (style) {
        gElt.style.cssText = style;
      }
      if (className == "CodeMirror-linenumbers") {
        display.lineGutter = gElt;
        gElt.style.width = (display.lineNumWidth || 1) + "px";
      }
    }
    gutters.style.display = specs.length ? "" : "none";
    updateGutterSpace(display);
  }

  function updateGutters(cm) {
    renderGutters(cm.display);
    regChange(cm);
    alignHorizontally(cm);
  }

  // The display handles the DOM integration, both for input reading
  // and content drawing. It holds references to DOM nodes and
  // display-related state.

  function Display(place, doc, input, options) {
    var d = this;
    this.input = input;

    // Covers bottom-right square when both scrollbars are present.
    d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
    d.scrollbarFiller.setAttribute("cm-not-content", "true");
    // Covers bottom of gutter when coverGutterNextToScrollbar is on
    // and h scrollbar is present.
    d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
    d.gutterFiller.setAttribute("cm-not-content", "true");
    // Will contain the actual code, positioned to cover the viewport.
    d.lineDiv = eltP("div", null, "CodeMirror-code");
    // Elements are added to these to represent selection and cursors.
    d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
    d.cursorDiv = elt("div", null, "CodeMirror-cursors");
    // A visibility: hidden element used to find the size of things.
    d.measure = elt("div", null, "CodeMirror-measure");
    // When lines outside of the viewport are measured, they are drawn in this.
    d.lineMeasure = elt("div", null, "CodeMirror-measure");
    // Wraps everything that needs to exist inside the vertically-padded coordinate system
    d.lineSpace = eltP(
      "div",
      [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
      null,
      "position: relative; outline: none"
    );
    var lines = eltP("div", [d.lineSpace], "CodeMirror-lines");
    // Moved around its parent to cover visible view.
    d.mover = elt("div", [lines], null, "position: relative");
    // Set to the height of the document, allowing scrolling.
    d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
    d.sizerWidth = null;
    // Behavior of elts with overflow: auto and padding is
    // inconsistent across browsers. This is used to ensure the
    // scrollable area is big enough.
    d.heightForcer = elt(
      "div",
      null,
      null,
      "position: absolute; height: " + scrollerGap + "px; width: 1px;"
    );
    // Will contain the gutters, if any.
    d.gutters = elt("div", null, "CodeMirror-gutters");
    d.lineGutter = null;
    // Actual scrollable element.
    d.scroller = elt(
      "div",
      [d.sizer, d.heightForcer, d.gutters],
      "CodeMirror-scroll"
    );
    d.scroller.setAttribute("tabIndex", "-1");
    // The element in which the editor lives.
    d.wrapper = elt(
      "div",
      [d.scrollbarFiller, d.gutterFiller, d.scroller],
      "CodeMirror"
    );

    // This attribute is respected by automatic translation systems such as Google Translate,
    // and may also be respected by tools used by human translators.
    d.wrapper.setAttribute("translate", "no");

    // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
    if (ie && ie_version < 8) {
      d.gutters.style.zIndex = -1;
      d.scroller.style.paddingRight = 0;
    }
    if (!webkit && !(gecko && mobile)) {
      d.scroller.draggable = true;
    }

    if (place) {
      if (place.appendChild) {
        place.appendChild(d.wrapper);
      } else {
        place(d.wrapper);
      }
    }

    // Current rendered range (may be bigger than the view window).
    d.viewFrom = d.viewTo = doc.first;
    d.reportedViewFrom = d.reportedViewTo = doc.first;
    // Information about the rendered lines.
    d.view = [];
    d.renderedView = null;
    // Holds info about a single rendered line when it was rendered
    // for measurement, while not in view.
    d.externalMeasured = null;
    // Empty space (in pixels) above the view
    d.viewOffset = 0;
    d.lastWrapHeight = d.lastWrapWidth = 0;
    d.updateLineNumbers = null;

    d.nativeBarWidth = d.barHeight = d.barWidth = 0;
    d.scrollbarsClipped = false;

    // Used to only resize the line number gutter when necessary (when
    // the amount of lines crosses a boundary that makes its width change)
    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
    // Set to true when a non-horizontal-scrolling line widget is
    // added. As an optimization, line widget aligning is skipped when
    // this is false.
    d.alignWidgets = false;

    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;

    // Tracks the maximum line length so that the horizontal scrollbar
    // can be kept static when scrolling.
    d.maxLine = null;
    d.maxLineLength = 0;
    d.maxLineChanged = false;

    // Used for measuring wheel scrolling granularity
    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;

    // True when shift is held down.
    d.shift = false;

    // Used to track whether anything happened since the context menu
    // was opened.
    d.selForContextMenu = null;

    d.activeTouch = null;

    d.gutterSpecs = getGutters(options.gutters, options.lineNumbers);
    renderGutters(d);

    input.init(d);
  }

  // Since the delta values reported on mouse wheel events are
  // unstandardized between browsers and even browser versions, and
  // generally horribly unpredictable, this code starts by measuring
  // the scroll effect that the first few mouse wheel events have,
  // and, from that, detects the way it can convert deltas to pixel
  // offsets afterwards.
  //
  // The reason we want to know the amount a wheel event will scroll
  // is that it gives us a chance to update the display before the
  // actual scrolling happens, reducing flickering.

  var wheelSamples = 0,
    wheelPixelsPerUnit = null;
  // Fill in a browser-detected starting value on browsers where we
  // know one. These don't have to be accurate -- the result of them
  // being wrong would just be a slight flicker on the first wheel
  // scroll (if it is large enough).
  if (ie) {
    wheelPixelsPerUnit = -0.53;
  } else if (gecko) {
    wheelPixelsPerUnit = 15;
  } else if (chrome) {
    wheelPixelsPerUnit = -0.7;
  } else if (safari) {
    wheelPixelsPerUnit = -1 / 3;
  }

  function wheelEventDelta(e) {
    var dx = e.wheelDeltaX,
      dy = e.wheelDeltaY;
    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) {
      dx = e.detail;
    }
    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) {
      dy = e.detail;
    } else if (dy == null) {
      dy = e.wheelDelta;
    }
    return { x: dx, y: dy };
  }
  function wheelEventPixels(e) {
    var delta = wheelEventDelta(e);
    delta.x *= wheelPixelsPerUnit;
    delta.y *= wheelPixelsPerUnit;
    return delta;
  }

  function onScrollWheel(cm, e) {
    var delta = wheelEventDelta(e),
      dx = delta.x,
      dy = delta.y;

    var display = cm.display,
      scroll = display.scroller;
    // Quit if there's nothing to scroll here
    var canScrollX = scroll.scrollWidth > scroll.clientWidth;
    var canScrollY = scroll.scrollHeight > scroll.clientHeight;
    if (!((dx && canScrollX) || (dy && canScrollY))) {
      return;
    }

    // Webkit browsers on OS X abort momentum scrolls when the target
    // of the scroll event is removed from the scrollable element.
    // This hack (see related code in patchDisplay) makes sure the
    // element is kept around.
    if (dy && mac && webkit) {
      outer: for (
        var cur = e.target, view = display.view;
        cur != scroll;
        cur = cur.parentNode
      ) {
        for (var i = 0; i < view.length; i++) {
          if (view[i].node == cur) {
            cm.display.currentWheelTarget = cur;
            break outer;
          }
        }
      }
    }

    // On some browsers, horizontal scrolling will cause redraws to
    // happen before the gutter has been realigned, causing it to
    // wriggle around in a most unseemly way. When we have an
    // estimated pixels/delta value, we just handle horizontal
    // scrolling entirely here. It'll be slightly off from native, but
    // better than glitching out.
    if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
      if (dy && canScrollY) {
        updateScrollTop(
          cm,
          Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit)
        );
      }
      setScrollLeft(
        cm,
        Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit)
      );
      // Only prevent default scrolling if vertical scrolling is
      // actually possible. Otherwise, it causes vertical scroll
      // jitter on OSX trackpads when deltaX is small and deltaY
      // is large (issue #3579)
      if (!dy || (dy && canScrollY)) {
        e_preventDefault(e);
      }
      display.wheelStartX = null; // Abort measurement, if in progress
      return;
    }

    // 'Project' the visible viewport to cover the area that is being
    // scrolled into view (if we know enough to estimate it).
    if (dy && wheelPixelsPerUnit != null) {
      var pixels = dy * wheelPixelsPerUnit;
      var top = cm.doc.scrollTop,
        bot = top + display.wrapper.clientHeight;
      if (pixels < 0) {
        top = Math.max(0, top + pixels - 50);
      } else {
        bot = Math.min(cm.doc.height, bot + pixels + 50);
      }
      updateDisplaySimple(cm, { top: top, bottom: bot });
    }

    if (wheelSamples < 20) {
      if (display.wheelStartX == null) {
        display.wheelStartX = scroll.scrollLeft;
        display.wheelStartY = scroll.scrollTop;
        display.wheelDX = dx;
        display.wheelDY = dy;
        setTimeout(function () {
          if (display.wheelStartX == null) {
            return;
          }
          var movedX = scroll.scrollLeft - display.wheelStartX;
          var movedY = scroll.scrollTop - display.wheelStartY;
          var sample =
            (movedY && display.wheelDY && movedY / display.wheelDY) ||
            (movedX && display.wheelDX && movedX / display.wheelDX);
          display.wheelStartX = display.wheelStartY = null;
          if (!sample) {
            return;
          }
          wheelPixelsPerUnit =
            (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
          ++wheelSamples;
        }, 200);
      } else {
        display.wheelDX += dx;
        display.wheelDY += dy;
      }
    }
  }

  // Selection objects are immutable. A new one is created every time
  // the selection changes. A selection is one or more non-overlapping
  // (and non-touching) ranges, sorted, and an integer that indicates
  // which one is the primary selection (the one that's scrolled into
  // view, that getCursor returns, etc).
  var Selection = function (ranges, primIndex) {
    this.ranges = ranges;
    this.primIndex = primIndex;
  };

  Selection.prototype.primary = function () {
    return this.ranges[this.primIndex];
  };

  Selection.prototype.equals = function (other) {
    if (other == this) {
      return true;
    }
    if (
      other.primIndex != this.primIndex ||
      other.ranges.length != this.ranges.length
    ) {
      return false;
    }
    for (var i = 0; i < this.ranges.length; i++) {
      var here = this.ranges[i],
        there = other.ranges[i];
      if (
        !equalCursorPos(here.anchor, there.anchor) ||
        !equalCursorPos(here.head, there.head)
      ) {
        return false;
      }
    }
    return true;
  };

  Selection.prototype.deepCopy = function () {
    var out = [];
    for (var i = 0; i < this.ranges.length; i++) {
      out[i] = new Range(
        copyPos(this.ranges[i].anchor),
        copyPos(this.ranges[i].head)
      );
    }
    return new Selection(out, this.primIndex);
  };

  Selection.prototype.somethingSelected = function () {
    for (var i = 0; i < this.ranges.length; i++) {
      if (!this.ranges[i].empty()) {
        return true;
      }
    }
    return false;
  };

  Selection.prototype.contains = function (pos, end) {
    if (!end) {
      end = pos;
    }
    for (var i = 0; i < this.ranges.length; i++) {
      var range = this.ranges[i];
      if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0) {
        return i;
      }
    }
    return -1;
  };

  var Range = function (anchor, head) {
    this.anchor = anchor;
    this.head = head;
  };

  Range.prototype.from = function () {
    return minPos(this.anchor, this.head);
  };
  Range.prototype.to = function () {
    return maxPos(this.anchor, this.head);
  };
  Range.prototype.empty = function () {
    return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch;
  };

  // Take an unsorted, potentially overlapping set of ranges, and
  // build a selection out of it. 'Consumes' ranges array (modifying
  // it).
  function normalizeSelection(cm, ranges, primIndex) {
    var mayTouch = cm && cm.options.selectionsMayTouch;
    var prim = ranges[primIndex];
    ranges.sort(function (a, b) {
      return cmp(a.from(), b.from());
    });
    primIndex = indexOf(ranges, prim);
    for (var i = 1; i < ranges.length; i++) {
      var cur = ranges[i],
        prev = ranges[i - 1];
      var diff = cmp(prev.to(), cur.from());
      if (mayTouch && !cur.empty() ? diff > 0 : diff >= 0) {
        var from = minPos(prev.from(), cur.from()),
          to = maxPos(prev.to(), cur.to());
        var inv = prev.empty()
          ? cur.from() == cur.head
          : prev.from() == prev.head;
        if (i <= primIndex) {
          --primIndex;
        }
        ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
      }
    }
    return new Selection(ranges, primIndex);
  }

  function simpleSelection(anchor, head) {
    return new Selection([new Range(anchor, head || anchor)], 0);
  }

  // Compute the position of the end of a change (its 'to' property
  // refers to the pre-change end).
  function changeEnd(change) {
    if (!change.text) {
      return change.to;
    }
    return Pos(
      change.from.line + change.text.length - 1,
      lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0)
    );
  }

  // Adjust a position to refer to the post-change position of the
  // same text, or the end of the change if the change covers it.
  function adjustForChange(pos, change) {
    if (cmp(pos, change.from) < 0) {
      return pos;
    }
    if (cmp(pos, change.to) <= 0) {
      return changeEnd(change);
    }

    var line =
        pos.line + change.text.length - (change.to.line - change.from.line) - 1,
      ch = pos.ch;
    if (pos.line == change.to.line) {
      ch += changeEnd(change).ch - change.to.ch;
    }
    return Pos(line, ch);
  }

  function computeSelAfterChange(doc, change) {
    var out = [];
    for (var i = 0; i < doc.sel.ranges.length; i++) {
      var range = doc.sel.ranges[i];
      out.push(
        new Range(
          adjustForChange(range.anchor, change),
          adjustForChange(range.head, change)
        )
      );
    }
    return normalizeSelection(doc.cm, out, doc.sel.primIndex);
  }

  function offsetPos(pos, old, nw) {
    if (pos.line == old.line) {
      return Pos(nw.line, pos.ch - old.ch + nw.ch);
    } else {
      return Pos(nw.line + (pos.line - old.line), pos.ch);
    }
  }

  // Used by replaceSelections to allow moving the selection to the
  // start or around the replaced test. Hint may be "start" or "around".
  function computeReplacedSel(doc, changes, hint) {
    var out = [];
    var oldPrev = Pos(doc.first, 0),
      newPrev = oldPrev;
    for (var i = 0; i < changes.length; i++) {
      var change = changes[i];
      var from = offsetPos(change.from, oldPrev, newPrev);
      var to = offsetPos(changeEnd(change), oldPrev, newPrev);
      oldPrev = change.to;
      newPrev = to;
      if (hint == "around") {
        var range = doc.sel.ranges[i],
          inv = cmp(range.head, range.anchor) < 0;
        out[i] = new Range(inv ? to : from, inv ? from : to);
      } else {
        out[i] = new Range(from, from);
      }
    }
    return new Selection(out, doc.sel.primIndex);
  }

  // Used to get the editor into a consistent state again when options change.

  function loadMode(cm) {
    cm.doc.mode = getMode(cm.options, cm.doc.modeOption);
    resetModeState(cm);
  }

  function resetModeState(cm) {
    cm.doc.iter(function (line) {
      if (line.stateAfter) {
        line.stateAfter = null;
      }
      if (line.styles) {
        line.styles = null;
      }
    });
    cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;
    startWorker(cm, 100);
    cm.state.modeGen++;
    if (cm.curOp) {
      regChange(cm);
    }
  }

  // DOCUMENT DATA STRUCTURE

  // By default, updates that start and end at the beginning of a line
  // are treated specially, in order to make the association of line
  // widgets and marker elements with the text behave more intuitive.
  function isWholeLineUpdate(doc, change) {
    return (
      change.from.ch == 0 &&
      change.to.ch == 0 &&
      lst(change.text) == "" &&
      (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
    );
  }

  // Perform a change on the document data structure.
  function updateDoc(doc, change, markedSpans, estimateHeight) {
    function spansFor(n) {
      return markedSpans ? markedSpans[n] : null;
    }
    function update(line, text, spans) {
      updateLine(line, text, spans, estimateHeight);
      signalLater(line, "change", line, change);
    }
    function linesFor(start, end) {
      var result = [];
      for (var i = start; i < end; ++i) {
        result.push(new Line(text[i], spansFor(i), estimateHeight));
      }
      return result;
    }

    var from = change.from,
      to = change.to,
      text = change.text;
    var firstLine = getLine(doc, from.line),
      lastLine = getLine(doc, to.line);
    var lastText = lst(text),
      lastSpans = spansFor(text.length - 1),
      nlines = to.line - from.line;

    // Adjust the line structure
    if (change.full) {
      doc.insert(0, linesFor(0, text.length));
      doc.remove(text.length, doc.size - text.length);
    } else if (isWholeLineUpdate(doc, change)) {
      // This is a whole-line replace. Treated specially to make
      // sure line objects move the way they are supposed to.
      var added = linesFor(0, text.length - 1);
      update(lastLine, lastLine.text, lastSpans);
      if (nlines) {
        doc.remove(from.line, nlines);
      }
      if (added.length) {
        doc.insert(from.line, added);
      }
    } else if (firstLine == lastLine) {
      if (text.length == 1) {
        update(
          firstLine,
          firstLine.text.slice(0, from.ch) +
            lastText +
            firstLine.text.slice(to.ch),
          lastSpans
        );
      } else {
        var added$1 = linesFor(1, text.length - 1);
        added$1.push(
          new Line(
            lastText + firstLine.text.slice(to.ch),
            lastSpans,
            estimateHeight
          )
        );
        update(
          firstLine,
          firstLine.text.slice(0, from.ch) + text[0],
          spansFor(0)
        );
        doc.insert(from.line + 1, added$1);
      }
    } else if (text.length == 1) {
      update(
        firstLine,
        firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch),
        spansFor(0)
      );
      doc.remove(from.line + 1, nlines);
    } else {
      update(
        firstLine,
        firstLine.text.slice(0, from.ch) + text[0],
        spansFor(0)
      );
      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
      var added$2 = linesFor(1, text.length - 1);
      if (nlines > 1) {
        doc.remove(from.line + 1, nlines - 1);
      }
      doc.insert(from.line + 1, added$2);
    }

    signalLater(doc, "change", doc, change);
  }

  // Call f for all linked documents.
  function linkedDocs(doc, f, sharedHistOnly) {
    function propagate(doc, skip, sharedHist) {
      if (doc.linked) {
        for (var i = 0; i < doc.linked.length; ++i) {
          var rel = doc.linked[i];
          if (rel.doc == skip) {
            continue;
          }
          var shared = sharedHist && rel.sharedHist;
          if (sharedHistOnly && !shared) {
            continue;
          }
          f(rel.doc, shared);
          propagate(rel.doc, doc, shared);
        }
      }
    }
    propagate(doc, null, true);
  }

  // Attach a document to an editor.
  function attachDoc(cm, doc) {
    if (doc.cm) {
      throw new Error("This document is already in use.");
    }
    cm.doc = doc;
    doc.cm = cm;
    estimateLineHeights(cm);
    loadMode(cm);
    setDirectionClass(cm);
    cm.options.direction = doc.direction;
    if (!cm.options.lineWrapping) {
      findMaxLine(cm);
    }
    cm.options.mode = doc.modeOption;
    regChange(cm);
  }

  function setDirectionClass(cm) {
    (cm.doc.direction == "rtl"
      ? addClass
      : rmClass)(cm.display.lineDiv, "CodeMirror-rtl");
  }

  function directionChanged(cm) {
    runInOp(cm, function () {
      setDirectionClass(cm);
      regChange(cm);
    });
  }

  function History(prev) {
    // Arrays of change events and selections. Doing something adds an
    // event to done and clears undo. Undoing moves events from done
    // to undone, redoing moves them in the other direction.
    this.done = [];
    this.undone = [];
    this.undoDepth = prev ? prev.undoDepth : Infinity;
    // Used to track when changes can be merged into a single undo
    // event
    this.lastModTime = this.lastSelTime = 0;
    this.lastOp = this.lastSelOp = null;
    this.lastOrigin = this.lastSelOrigin = null;
    // Used by the isClean() method
    this.generation = this.maxGeneration = prev ? prev.maxGeneration : 1;
  }

  // Create a history change event from an updateDoc-style change
  // object.
  function historyChangeFromChange(doc, change) {
    var histChange = {
      from: copyPos(change.from),
      to: changeEnd(change),
      text: getBetween(doc, change.from, change.to),
    };
    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
    linkedDocs(
      doc,
      function (doc) {
        return attachLocalSpans(
          doc,
          histChange,
          change.from.line,
          change.to.line + 1
        );
      },
      true
    );
    return histChange;
  }

  // Pop all selection events off the end of a history array. Stop at
  // a change event.
  function clearSelectionEvents(array) {
    while (array.length) {
      var last = lst(array);
      if (last.ranges) {
        array.pop();
      } else {
        break;
      }
    }
  }

  // Find the top change event in the history. Pop off selection
  // events that are in the way.
  function lastChangeEvent(hist, force) {
    if (force) {
      clearSelectionEvents(hist.done);
      return lst(hist.done);
    } else if (hist.done.length && !lst(hist.done).ranges) {
      return lst(hist.done);
    } else if (
      hist.done.length > 1 &&
      !hist.done[hist.done.length - 2].ranges
    ) {
      hist.done.pop();
      return lst(hist.done);
    }
  }

  // Register a change in the history. Merges changes that are within
  // a single operation, or are close together with an origin that
  // allows merging (starting with "+") into a single event.
  function addChangeToHistory(doc, change, selAfter, opId) {
    var hist = doc.history;
    hist.undone.length = 0;
    var time = +new Date(),
      cur;
    var last;

    if (
      (hist.lastOp == opId ||
        (hist.lastOrigin == change.origin &&
          change.origin &&
          ((change.origin.charAt(0) == "+" &&
            hist.lastModTime >
              time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||
            change.origin.charAt(0) == "*"))) &&
      (cur = lastChangeEvent(hist, hist.lastOp == opId))
    ) {
      // Merge this change into the last event
      last = lst(cur.changes);
      if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
        // Optimized case for simple insertion -- don't want to add
        // new changesets for every character typed
        last.to = changeEnd(change);
      } else {
        // Add new sub-event
        cur.changes.push(historyChangeFromChange(doc, change));
      }
    } else {
      // Can not be merged, start a new event.
      var before = lst(hist.done);
      if (!before || !before.ranges) {
        pushSelectionToHistory(doc.sel, hist.done);
      }
      cur = {
        changes: [historyChangeFromChange(doc, change)],
        generation: hist.generation,
      };
      hist.done.push(cur);
      while (hist.done.length > hist.undoDepth) {
        hist.done.shift();
        if (!hist.done[0].ranges) {
          hist.done.shift();
        }
      }
    }
    hist.done.push(selAfter);
    hist.generation = ++hist.maxGeneration;
    hist.lastModTime = hist.lastSelTime = time;
    hist.lastOp = hist.lastSelOp = opId;
    hist.lastOrigin = hist.lastSelOrigin = change.origin;

    if (!last) {
      signal(doc, "historyAdded");
    }
  }

  function selectionEventCanBeMerged(doc, origin, prev, sel) {
    var ch = origin.charAt(0);
    return (
      ch == "*" ||
      (ch == "+" &&
        prev.ranges.length == sel.ranges.length &&
        prev.somethingSelected() == sel.somethingSelected() &&
        new Date() - doc.history.lastSelTime <=
          (doc.cm ? doc.cm.options.historyEventDelay : 500))
    );
  }

  // Called whenever the selection changes, sets the new selection as
  // the pending selection in the history, and pushes the old pending
  // selection into the 'done' array when it was significantly
  // different (in number of selected ranges, emptiness, or time).
  function addSelectionToHistory(doc, sel, opId, options) {
    var hist = doc.history,
      origin = options && options.origin;

    // A new event is started when the previous origin does not match
    // the current, or the origins don't allow matching. Origins
    // starting with * are always merged, those starting with + are
    // merged when similar and close together in time.
    if (
      opId == hist.lastSelOp ||
      (origin &&
        hist.lastSelOrigin == origin &&
        ((hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin) ||
          selectionEventCanBeMerged(doc, origin, lst(hist.done), sel)))
    ) {
      hist.done[hist.done.length - 1] = sel;
    } else {
      pushSelectionToHistory(sel, hist.done);
    }

    hist.lastSelTime = +new Date();
    hist.lastSelOrigin = origin;
    hist.lastSelOp = opId;
    if (options && options.clearRedo !== false) {
      clearSelectionEvents(hist.undone);
    }
  }

  function pushSelectionToHistory(sel, dest) {
    var top = lst(dest);
    if (!(top && top.ranges && top.equals(sel))) {
      dest.push(sel);
    }
  }

  // Used to store marked span information in the history.
  function attachLocalSpans(doc, change, from, to) {
    var existing = change["spans_" + doc.id],
      n = 0;
    doc.iter(
      Math.max(doc.first, from),
      Math.min(doc.first + doc.size, to),
      function (line) {
        if (line.markedSpans) {
          (existing || (existing = change["spans_" + doc.id] = {}))[n] =
            line.markedSpans;
        }
        ++n;
      }
    );
  }

  // When un/re-doing restores text containing marked spans, those
  // that have been explicitly cleared should not be restored.
  function removeClearedSpans(spans) {
    if (!spans) {
      return null;
    }
    var out;
    for (var i = 0; i < spans.length; ++i) {
      if (spans[i].marker.explicitlyCleared) {
        if (!out) {
          out = spans.slice(0, i);
        }
      } else if (out) {
        out.push(spans[i]);
      }
    }
    return !out ? spans : out.length ? out : null;
  }

  // Retrieve and filter the old marked spans stored in a change event.
  function getOldSpans(doc, change) {
    var found = change["spans_" + doc.id];
    if (!found) {
      return null;
    }
    var nw = [];
    for (var i = 0; i < change.text.length; ++i) {
      nw.push(removeClearedSpans(found[i]));
    }
    return nw;
  }

  // Used for un/re-doing changes from the history. Combines the
  // result of computing the existing spans with the set of spans that
  // existed in the history (so that deleting around a span and then
  // undoing brings back the span).
  function mergeOldSpans(doc, change) {
    var old = getOldSpans(doc, change);
    var stretched = stretchSpansOverChange(doc, change);
    if (!old) {
      return stretched;
    }
    if (!stretched) {
      return old;
    }

    for (var i = 0; i < old.length; ++i) {
      var oldCur = old[i],
        stretchCur = stretched[i];
      if (oldCur && stretchCur) {
        spans: for (var j = 0; j < stretchCur.length; ++j) {
          var span = stretchCur[j];
          for (var k = 0; k < oldCur.length; ++k) {
            if (oldCur[k].marker == span.marker) {
              continue spans;
            }
          }
          oldCur.push(span);
        }
      } else if (stretchCur) {
        old[i] = stretchCur;
      }
    }
    return old;
  }

  // Used both to provide a JSON-safe object in .getHistory, and, when
  // detaching a document, to split the history in two
  function copyHistoryArray(events, newGroup, instantiateSel) {
    var copy = [];
    for (var i = 0; i < events.length; ++i) {
      var event = events[i];
      if (event.ranges) {
        copy.push(
          instantiateSel ? Selection.prototype.deepCopy.call(event) : event
        );
        continue;
      }
      var changes = event.changes,
        newChanges = [];
      copy.push({ changes: newChanges });
      for (var j = 0; j < changes.length; ++j) {
        var change = changes[j],
          m = void 0;
        newChanges.push({
          from: change.from,
          to: change.to,
          text: change.text,
        });
        if (newGroup) {
          for (var prop in change) {
            if ((m = prop.match(/^spans_(\d+)$/))) {
              if (indexOf(newGroup, Number(m[1])) > -1) {
                lst(newChanges)[prop] = change[prop];
                delete change[prop];
              }
            }
          }
        }
      }
    }
    return copy;
  }

  // The 'scroll' parameter given to many of these indicated whether
  // the new cursor position should be scrolled into view after
  // modifying the selection.

  // If shift is held or the extend flag is set, extends a range to
  // include a given position (and optionally a second position).
  // Otherwise, simply returns the range between the given positions.
  // Used for cursor motion and such.
  function extendRange(range, head, other, extend) {
    if (extend) {
      var anchor = range.anchor;
      if (other) {
        var posBefore = cmp(head, anchor) < 0;
        if (posBefore != cmp(other, anchor) < 0) {
          anchor = head;
          head = other;
        } else if (posBefore != cmp(head, other) < 0) {
          head = other;
        }
      }
      return new Range(anchor, head);
    } else {
      return new Range(other || head, head);
    }
  }

  // Extend the primary selection range, discard the rest.
  function extendSelection(doc, head, other, options, extend) {
    if (extend == null) {
      extend = doc.cm && (doc.cm.display.shift || doc.extend);
    }
    setSelection(
      doc,
      new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0),
      options
    );
  }

  // Extend all selections (pos is an array of selections with length
  // equal the number of selections)
  function extendSelections(doc, heads, options) {
    var out = [];
    var extend = doc.cm && (doc.cm.display.shift || doc.extend);
    for (var i = 0; i < doc.sel.ranges.length; i++) {
      out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend);
    }
    var newSel = normalizeSelection(doc.cm, out, doc.sel.primIndex);
    setSelection(doc, newSel, options);
  }

  // Updates a single range in the selection.
  function replaceOneSelection(doc, i, range, options) {
    var ranges = doc.sel.ranges.slice(0);
    ranges[i] = range;
    setSelection(
      doc,
      normalizeSelection(doc.cm, ranges, doc.sel.primIndex),
      options
    );
  }

  // Reset the selection to a single range.
  function setSimpleSelection(doc, anchor, head, options) {
    setSelection(doc, simpleSelection(anchor, head), options);
  }

  // Give beforeSelectionChange handlers a change to influence a
  // selection update.
  function filterSelectionChange(doc, sel, options) {
    var obj = {
      ranges: sel.ranges,
      update: function (ranges) {
        this.ranges = [];
        for (var i = 0; i < ranges.length; i++) {
          this.ranges[i] = new Range(
            clipPos(doc, ranges[i].anchor),
            clipPos(doc, ranges[i].head)
          );
        }
      },
      origin: options && options.origin,
    };
    signal(doc, "beforeSelectionChange", doc, obj);
    if (doc.cm) {
      signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
    }
    if (obj.ranges != sel.ranges) {
      return normalizeSelection(doc.cm, obj.ranges, obj.ranges.length - 1);
    } else {
      return sel;
    }
  }

  function setSelectionReplaceHistory(doc, sel, options) {
    var done = doc.history.done,
      last = lst(done);
    if (last && last.ranges) {
      done[done.length - 1] = sel;
      setSelectionNoUndo(doc, sel, options);
    } else {
      setSelection(doc, sel, options);
    }
  }

  // Set a new selection.
  function setSelection(doc, sel, options) {
    setSelectionNoUndo(doc, sel, options);
    addSelectionToHistory(
      doc,
      doc.sel,
      doc.cm ? doc.cm.curOp.id : NaN,
      options
    );
  }

  function setSelectionNoUndo(doc, sel, options) {
    if (
      hasHandler(doc, "beforeSelectionChange") ||
      (doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
    ) {
      sel = filterSelectionChange(doc, sel, options);
    }

    var bias =
      (options && options.bias) ||
      (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
    setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));

    if (
      !(options && options.scroll === false) &&
      doc.cm &&
      doc.cm.getOption("readOnly") != "nocursor"
    ) {
      ensureCursorVisible(doc.cm);
    }
  }

  function setSelectionInner(doc, sel) {
    if (sel.equals(doc.sel)) {
      return;
    }

    doc.sel = sel;

    if (doc.cm) {
      doc.cm.curOp.updateInput = 1;
      doc.cm.curOp.selectionChanged = true;
      signalCursorActivity(doc.cm);
    }
    signalLater(doc, "cursorActivity", doc);
  }

  // Verify that the selection does not partially select any atomic
  // marked ranges.
  function reCheckSelection(doc) {
    setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));
  }

  // Return a selection that does not partially select any atomic
  // ranges.
  function skipAtomicInSelection(doc, sel, bias, mayClear) {
    var out;
    for (var i = 0; i < sel.ranges.length; i++) {
      var range = sel.ranges[i];
      var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
      var newAnchor = skipAtomic(
        doc,
        range.anchor,
        old && old.anchor,
        bias,
        mayClear
      );
      var newHead = skipAtomic(
        doc,
        range.head,
        old && old.head,
        bias,
        mayClear
      );
      if (out || newAnchor != range.anchor || newHead != range.head) {
        if (!out) {
          out = sel.ranges.slice(0, i);
        }
        out[i] = new Range(newAnchor, newHead);
      }
    }
    return out ? normalizeSelection(doc.cm, out, sel.primIndex) : sel;
  }

  function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
    var line = getLine(doc, pos.line);
    if (line.markedSpans) {
      for (var i = 0; i < line.markedSpans.length; ++i) {
        var sp = line.markedSpans[i],
          m = sp.marker;

        // Determine if we should prevent the cursor being placed to the left/right of an atomic marker
        // Historically this was determined using the inclusiveLeft/Right option, but the new way to control it
        // is with selectLeft/Right
        var preventCursorLeft =
          "selectLeft" in m ? !m.selectLeft : m.inclusiveLeft;
        var preventCursorRight =
          "selectRight" in m ? !m.selectRight : m.inclusiveRight;

        if (
          (sp.from == null ||
            (preventCursorLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
          (sp.to == null ||
            (preventCursorRight ? sp.to >= pos.ch : sp.to > pos.ch))
        ) {
          if (mayClear) {
            signal(m, "beforeCursorEnter");
            if (m.explicitlyCleared) {
              if (!line.markedSpans) {
                break;
              } else {
                --i;
                continue;
              }
            }
          }
          if (!m.atomic) {
            continue;
          }

          if (oldPos) {
            var near = m.find(dir < 0 ? 1 : -1),
              diff = void 0;
            if (dir < 0 ? preventCursorRight : preventCursorLeft) {
              near = movePos(
                doc,
                near,
                -dir,
                near && near.line == pos.line ? line : null
              );
            }
            if (
              near &&
              near.line == pos.line &&
              (diff = cmp(near, oldPos)) &&
              (dir < 0 ? diff < 0 : diff > 0)
            ) {
              return skipAtomicInner(doc, near, pos, dir, mayClear);
            }
          }

          var far = m.find(dir < 0 ? -1 : 1);
          if (dir < 0 ? preventCursorLeft : preventCursorRight) {
            far = movePos(doc, far, dir, far.line == pos.line ? line : null);
          }
          return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null;
        }
      }
    }
    return pos;
  }

  // Ensure a given position is not inside an atomic range.
  function skipAtomic(doc, pos, oldPos, bias, mayClear) {
    var dir = bias || 1;
    var found =
      skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
      (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
      skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
      (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
    if (!found) {
      doc.cantEdit = true;
      return Pos(doc.first, 0);
    }
    return found;
  }

  function movePos(doc, pos, dir, line) {
    if (dir < 0 && pos.ch == 0) {
      if (pos.line > doc.first) {
        return clipPos(doc, Pos(pos.line - 1));
      } else {
        return null;
      }
    } else if (
      dir > 0 &&
      pos.ch == (line || getLine(doc, pos.line)).text.length
    ) {
      if (pos.line < doc.first + doc.size - 1) {
        return Pos(pos.line + 1, 0);
      } else {
        return null;
      }
    } else {
      return new Pos(pos.line, pos.ch + dir);
    }
  }

  function selectAll(cm) {
    cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
  }

  // UPDATING

  // Allow "beforeChange" event handlers to influence a change
  function filterChange(doc, change, update) {
    var obj = {
      canceled: false,
      from: change.from,
      to: change.to,
      text: change.text,
      origin: change.origin,
      cancel: function () {
        return (obj.canceled = true);
      },
    };
    if (update) {
      obj.update = function (from, to, text, origin) {
        if (from) {
          obj.from = clipPos(doc, from);
        }
        if (to) {
          obj.to = clipPos(doc, to);
        }
        if (text) {
          obj.text = text;
        }
        if (origin !== undefined) {
          obj.origin = origin;
        }
      };
    }
    signal(doc, "beforeChange", doc, obj);
    if (doc.cm) {
      signal(doc.cm, "beforeChange", doc.cm, obj);
    }

    if (obj.canceled) {
      if (doc.cm) {
        doc.cm.curOp.updateInput = 2;
      }
      return null;
    }
    return { from: obj.from, to: obj.to, text: obj.text, origin: obj.origin };
  }

  // Apply a change to a document, and add it to the document's
  // history, and propagating it to all linked documents.
  function makeChange(doc, change, ignoreReadOnly) {
    if (doc.cm) {
      if (!doc.cm.curOp) {
        return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly);
      }
      if (doc.cm.state.suppressEdits) {
        return;
      }
    }

    if (
      hasHandler(doc, "beforeChange") ||
      (doc.cm && hasHandler(doc.cm, "beforeChange"))
    ) {
      change = filterChange(doc, change, true);
      if (!change) {
        return;
      }
    }

    // Possibly split or suppress the update based on the presence
    // of read-only spans in its range.
    var split =
      sawReadOnlySpans &&
      !ignoreReadOnly &&
      removeReadOnlyRanges(doc, change.from, change.to);
    if (split) {
      for (var i = split.length - 1; i >= 0; --i) {
        makeChangeInner(doc, {
          from: split[i].from,
          to: split[i].to,
          text: i ? [""] : change.text,
          origin: change.origin,
        });
      }
    } else {
      makeChangeInner(doc, change);
    }
  }

  function makeChangeInner(doc, change) {
    if (
      change.text.length == 1 &&
      change.text[0] == "" &&
      cmp(change.from, change.to) == 0
    ) {
      return;
    }
    var selAfter = computeSelAfterChange(doc, change);
    addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);

    makeChangeSingleDoc(
      doc,
      change,
      selAfter,
      stretchSpansOverChange(doc, change)
    );
    var rebased = [];

    linkedDocs(doc, function (doc, sharedHist) {
      if (!sharedHist && indexOf(rebased, doc.history) == -1) {
        rebaseHist(doc.history, change);
        rebased.push(doc.history);
      }
      makeChangeSingleDoc(
        doc,
        change,
        null,
        stretchSpansOverChange(doc, change)
      );
    });
  }

  // Revert a change stored in a document's history.
  function makeChangeFromHistory(doc, type, allowSelectionOnly) {
    var suppress = doc.cm && doc.cm.state.suppressEdits;
    if (suppress && !allowSelectionOnly) {
      return;
    }

    var hist = doc.history,
      event,
      selAfter = doc.sel;
    var source = type == "undo" ? hist.done : hist.undone,
      dest = type == "undo" ? hist.undone : hist.done;

    // Verify that there is a useable event (so that ctrl-z won't
    // needlessly clear selection events)
    var i = 0;
    for (; i < source.length; i++) {
      event = source[i];
      if (
        allowSelectionOnly
          ? event.ranges && !event.equals(doc.sel)
          : !event.ranges
      ) {
        break;
      }
    }
    if (i == source.length) {
      return;
    }
    hist.lastOrigin = hist.lastSelOrigin = null;

    for (;;) {
      event = source.pop();
      if (event.ranges) {
        pushSelectionToHistory(event, dest);
        if (allowSelectionOnly && !event.equals(doc.sel)) {
          setSelection(doc, event, { clearRedo: false });
          return;
        }
        selAfter = event;
      } else if (suppress) {
        source.push(event);
        return;
      } else {
        break;
      }
    }

    // Build up a reverse change object to add to the opposite history
    // stack (redo when undoing, and vice versa).
    var antiChanges = [];
    pushSelectionToHistory(selAfter, dest);
    dest.push({ changes: antiChanges, generation: hist.generation });
    hist.generation = event.generation || ++hist.maxGeneration;

    var filter =
      hasHandler(doc, "beforeChange") ||
      (doc.cm && hasHandler(doc.cm, "beforeChange"));

    var loop = function (i) {
      var change = event.changes[i];
      change.origin = type;
      if (filter && !filterChange(doc, change, false)) {
        source.length = 0;
        return {};
      }

      antiChanges.push(historyChangeFromChange(doc, change));

      var after = i ? computeSelAfterChange(doc, change) : lst(source);
      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
      if (!i && doc.cm) {
        doc.cm.scrollIntoView({ from: change.from, to: changeEnd(change) });
      }
      var rebased = [];

      // Propagate to the linked documents
      linkedDocs(doc, function (doc, sharedHist) {
        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
          rebaseHist(doc.history, change);
          rebased.push(doc.history);
        }
        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
      });
    };

    for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
      var returned = loop(i$1);

      if (returned) return returned.v;
    }
  }

  // Sub-views need their line numbers shifted when text is added
  // above or below them in the parent document.
  function shiftDoc(doc, distance) {
    if (distance == 0) {
      return;
    }
    doc.first += distance;
    doc.sel = new Selection(
      map(doc.sel.ranges, function (range) {
        return new Range(
          Pos(range.anchor.line + distance, range.anchor.ch),
          Pos(range.head.line + distance, range.head.ch)
        );
      }),
      doc.sel.primIndex
    );
    if (doc.cm) {
      regChange(doc.cm, doc.first, doc.first - distance, distance);
      for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++) {
        regLineChange(doc.cm, l, "gutter");
      }
    }
  }

  // More lower-level change function, handling only a single document
  // (not linked ones).
  function makeChangeSingleDoc(doc, change, selAfter, spans) {
    if (doc.cm && !doc.cm.curOp) {
      return operation(doc.cm, makeChangeSingleDoc)(
        doc,
        change,
        selAfter,
        spans
      );
    }

    if (change.to.line < doc.first) {
      shiftDoc(
        doc,
        change.text.length - 1 - (change.to.line - change.from.line)
      );
      return;
    }
    if (change.from.line > doc.lastLine()) {
      return;
    }

    // Clip the change to the size of this doc
    if (change.from.line < doc.first) {
      var shift = change.text.length - 1 - (doc.first - change.from.line);
      shiftDoc(doc, shift);
      change = {
        from: Pos(doc.first, 0),
        to: Pos(change.to.line + shift, change.to.ch),
        text: [lst(change.text)],
        origin: change.origin,
      };
    }
    var last = doc.lastLine();
    if (change.to.line > last) {
      change = {
        from: change.from,
        to: Pos(last, getLine(doc, last).text.length),
        text: [change.text[0]],
        origin: change.origin,
      };
    }

    change.removed = getBetween(doc, change.from, change.to);

    if (!selAfter) {
      selAfter = computeSelAfterChange(doc, change);
    }
    if (doc.cm) {
      makeChangeSingleDocInEditor(doc.cm, change, spans);
    } else {
      updateDoc(doc, change, spans);
    }
    setSelectionNoUndo(doc, selAfter, sel_dontScroll);

    if (doc.cantEdit && skipAtomic(doc, Pos(doc.firstLine(), 0))) {
      doc.cantEdit = false;
    }
  }

  // Handle the interaction of a change to a document with the editor
  // that this document is part of.
  function makeChangeSingleDocInEditor(cm, change, spans) {
    var doc = cm.doc,
      display = cm.display,
      from = change.from,
      to = change.to;

    var recomputeMaxLength = false,
      checkWidthStart = from.line;
    if (!cm.options.lineWrapping) {
      checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
      doc.iter(checkWidthStart, to.line + 1, function (line) {
        if (line == display.maxLine) {
          recomputeMaxLength = true;
          return true;
        }
      });
    }

    if (doc.sel.contains(change.from, change.to) > -1) {
      signalCursorActivity(cm);
    }

    updateDoc(doc, change, spans, estimateHeight(cm));

    if (!cm.options.lineWrapping) {
      doc.iter(
        checkWidthStart,
        from.line + change.text.length,
        function (line) {
          var len = lineLength(line);
          if (len > display.maxLineLength) {
            display.maxLine = line;
            display.maxLineLength = len;
            display.maxLineChanged = true;
            recomputeMaxLength = false;
          }
        }
      );
      if (recomputeMaxLength) {
        cm.curOp.updateMaxLine = true;
      }
    }

    retreatFrontier(doc, from.line);
    startWorker(cm, 400);

    var lendiff = change.text.length - (to.line - from.line) - 1;
    // Remember that these lines changed, for updating the display
    if (change.full) {
      regChange(cm);
    } else if (
      from.line == to.line &&
      change.text.length == 1 &&
      !isWholeLineUpdate(cm.doc, change)
    ) {
      regLineChange(cm, from.line, "text");
    } else {
      regChange(cm, from.line, to.line + 1, lendiff);
    }

    var changesHandler = hasHandler(cm, "changes"),
      changeHandler = hasHandler(cm, "change");
    if (changeHandler || changesHandler) {
      var obj = {
        from: from,
        to: to,
        text: change.text,
        removed: change.removed,
        origin: change.origin,
      };
      if (changeHandler) {
        signalLater(cm, "change", cm, obj);
      }
      if (changesHandler) {
        (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj);
      }
    }
    cm.display.selForContextMenu = null;
  }

  function replaceRange(doc, code, from, to, origin) {
    var assign;

    if (!to) {
      to = from;
    }
    if (cmp(to, from) < 0) {
      (assign = [to, from]), (from = assign[0]), (to = assign[1]);
    }
    if (typeof code == "string") {
      code = doc.splitLines(code);
    }
    makeChange(doc, { from: from, to: to, text: code, origin: origin });
  }

  // Rebasing/resetting history to deal with externally-sourced changes

  function rebaseHistSelSingle(pos, from, to, diff) {
    if (to < pos.line) {
      pos.line += diff;
    } else if (from < pos.line) {
      pos.line = from;
      pos.ch = 0;
    }
  }

  // Tries to rebase an array of history events given a change in the
  // document. If the change touches the same lines as the event, the
  // event, and everything 'behind' it, is discarded. If the change is
  // before the event, the event's positions are updated. Uses a
  // copy-on-write scheme for the positions, to avoid having to
  // reallocate them all on every rebase, but also avoid problems with
  // shared position objects being unsafely updated.
  function rebaseHistArray(array, from, to, diff) {
    for (var i = 0; i < array.length; ++i) {
      var sub = array[i],
        ok = true;
      if (sub.ranges) {
        if (!sub.copied) {
          sub = array[i] = sub.deepCopy();
          sub.copied = true;
        }
        for (var j = 0; j < sub.ranges.length; j++) {
          rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
          rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
        }
        continue;
      }
      for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
        var cur = sub.changes[j$1];
        if (to < cur.from.line) {
          cur.from = Pos(cur.from.line + diff, cur.from.ch);
          cur.to = Pos(cur.to.line + diff, cur.to.ch);
        } else if (from <= cur.to.line) {
          ok = false;
          break;
        }
      }
      if (!ok) {
        array.splice(0, i + 1);
        i = 0;
      }
    }
  }

  function rebaseHist(hist, change) {
    var from = change.from.line,
      to = change.to.line,
      diff = change.text.length - (to - from) - 1;
    rebaseHistArray(hist.done, from, to, diff);
    rebaseHistArray(hist.undone, from, to, diff);
  }

  // Utility for applying a change to a line by handle or number,
  // returning the number and optionally registering the line as
  // changed.
  function changeLine(doc, handle, changeType, op) {
    var no = handle,
      line = handle;
    if (typeof handle == "number") {
      line = getLine(doc, clipLine(doc, handle));
    } else {
      no = lineNo(handle);
    }
    if (no == null) {
      return null;
    }
    if (op(line, no) && doc.cm) {
      regLineChange(doc.cm, no, changeType);
    }
    return line;
  }

  // The document is represented as a BTree consisting of leaves, with
  // chunk of lines in them, and branches, with up to ten leaves or
  // other branch nodes below them. The top node is always a branch
  // node, and is the document object itself (meaning it has
  // additional methods and properties).
  //
  // All nodes have parent links. The tree is used both to go from
  // line numbers to line objects, and to go from objects to numbers.
  // It also indexes by height, and is used to convert between height
  // and line object, and to find the total height of the document.
  //
  // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

  function LeafChunk(lines) {
    this.lines = lines;
    this.parent = null;
    var height = 0;
    for (var i = 0; i < lines.length; ++i) {
      lines[i].parent = this;
      height += lines[i].height;
    }
    this.height = height;
  }

  LeafChunk.prototype = {
    chunkSize: function () {
      return this.lines.length;
    },

    // Remove the n lines at offset 'at'.
    removeInner: function (at, n) {
      for (var i = at, e = at + n; i < e; ++i) {
        var line = this.lines[i];
        this.height -= line.height;
        cleanUpLine(line);
        signalLater(line, "delete");
      }
      this.lines.splice(at, n);
    },

    // Helper used to collapse a small branch into a single leaf.
    collapse: function (lines) {
      lines.push.apply(lines, this.lines);
    },

    // Insert the given array of lines at offset 'at', count them as
    // having the given height.
    insertInner: function (at, lines, height) {
      this.height += height;
      this.lines = this.lines
        .slice(0, at)
        .concat(lines)
        .concat(this.lines.slice(at));
      for (var i = 0; i < lines.length; ++i) {
        lines[i].parent = this;
      }
    },

    // Used to iterate over a part of the tree.
    iterN: function (at, n, op) {
      for (var e = at + n; at < e; ++at) {
        if (op(this.lines[at])) {
          return true;
        }
      }
    },
  };

  function BranchChunk(children) {
    this.children = children;
    var size = 0,
      height = 0;
    for (var i = 0; i < children.length; ++i) {
      var ch = children[i];
      size += ch.chunkSize();
      height += ch.height;
      ch.parent = this;
    }
    this.size = size;
    this.height = height;
    this.parent = null;
  }

  BranchChunk.prototype = {
    chunkSize: function () {
      return this.size;
    },

    removeInner: function (at, n) {
      this.size -= n;
      for (var i = 0; i < this.children.length; ++i) {
        var child = this.children[i],
          sz = child.chunkSize();
        if (at < sz) {
          var rm = Math.min(n, sz - at),
            oldHeight = child.height;
          child.removeInner(at, rm);
          this.height -= oldHeight - child.height;
          if (sz == rm) {
            this.children.splice(i--, 1);
            child.parent = null;
          }
          if ((n -= rm) == 0) {
            break;
          }
          at = 0;
        } else {
          at -= sz;
        }
      }
      // If the result is smaller than 25 lines, ensure that it is a
      // single leaf node.
      if (
        this.size - n < 25 &&
        (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))
      ) {
        var lines = [];
        this.collapse(lines);
        this.children = [new LeafChunk(lines)];
        this.children[0].parent = this;
      }
    },

    collapse: function (lines) {
      for (var i = 0; i < this.children.length; ++i) {
        this.children[i].collapse(lines);
      }
    },

    insertInner: function (at, lines, height) {
      this.size += lines.length;
      this.height += height;
      for (var i = 0; i < this.children.length; ++i) {
        var child = this.children[i],
          sz = child.chunkSize();
        if (at <= sz) {
          child.insertInner(at, lines, height);
          if (child.lines && child.lines.length > 50) {
            // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
            // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
            var remaining = (child.lines.length % 25) + 25;
            for (var pos = remaining; pos < child.lines.length; ) {
              var leaf = new LeafChunk(child.lines.slice(pos, (pos += 25)));
              child.height -= leaf.height;
              this.children.splice(++i, 0, leaf);
              leaf.parent = this;
            }
            child.lines = child.lines.slice(0, remaining);
            this.maybeSpill();
          }
          break;
        }
        at -= sz;
      }
    },

    // When a node has grown, check whether it should be split.
    maybeSpill: function () {
      if (this.children.length <= 10) {
        return;
      }
      var me = this;
      do {
        var spilled = me.children.splice(me.children.length - 5, 5);
        var sibling = new BranchChunk(spilled);
        if (!me.parent) {
          // Become the parent node
          var copy = new BranchChunk(me.children);
          copy.parent = me;
          me.children = [copy, sibling];
          me = copy;
        } else {
          me.size -= sibling.size;
          me.height -= sibling.height;
          var myIndex = indexOf(me.parent.children, me);
          me.parent.children.splice(myIndex + 1, 0, sibling);
        }
        sibling.parent = me.parent;
      } while (me.children.length > 10);
      me.parent.maybeSpill();
    },

    iterN: function (at, n, op) {
      for (var i = 0; i < this.children.length; ++i) {
        var child = this.children[i],
          sz = child.chunkSize();
        if (at < sz) {
          var used = Math.min(n, sz - at);
          if (child.iterN(at, used, op)) {
            return true;
          }
          if ((n -= used) == 0) {
            break;
          }
          at = 0;
        } else {
          at -= sz;
        }
      }
    },
  };

  // Line widgets are block elements displayed above or below a line.

  var LineWidget = function (doc, node, options) {
    if (options) {
      for (var opt in options) {
        if (options.hasOwnProperty(opt)) {
          this[opt] = options[opt];
        }
      }
    }
    this.doc = doc;
    this.node = node;
  };

  LineWidget.prototype.clear = function () {
    var cm = this.doc.cm,
      ws = this.line.widgets,
      line = this.line,
      no = lineNo(line);
    if (no == null || !ws) {
      return;
    }
    for (var i = 0; i < ws.length; ++i) {
      if (ws[i] == this) {
        ws.splice(i--, 1);
      }
    }
    if (!ws.length) {
      line.widgets = null;
    }
    var height = widgetHeight(this);
    updateLineHeight(line, Math.max(0, line.height - height));
    if (cm) {
      runInOp(cm, function () {
        adjustScrollWhenAboveVisible(cm, line, -height);
        regLineChange(cm, no, "widget");
      });
      signalLater(cm, "lineWidgetCleared", cm, this, no);
    }
  };

  LineWidget.prototype.changed = function () {
    var this$1 = this;

    var oldH = this.height,
      cm = this.doc.cm,
      line = this.line;
    this.height = null;
    var diff = widgetHeight(this) - oldH;
    if (!diff) {
      return;
    }
    if (!lineIsHidden(this.doc, line)) {
      updateLineHeight(line, line.height + diff);
    }
    if (cm) {
      runInOp(cm, function () {
        cm.curOp.forceUpdate = true;
        adjustScrollWhenAboveVisible(cm, line, diff);
        signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line));
      });
    }
  };
  eventMixin(LineWidget);

  function adjustScrollWhenAboveVisible(cm, line, diff) {
    if (
      heightAtLine(line) <
      ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop)
    ) {
      addToScrollTop(cm, diff);
    }
  }

  function addLineWidget(doc, handle, node, options) {
    var widget = new LineWidget(doc, node, options);
    var cm = doc.cm;
    if (cm && widget.noHScroll) {
      cm.display.alignWidgets = true;
    }
    changeLine(doc, handle, "widget", function (line) {
      var widgets = line.widgets || (line.widgets = []);
      if (widget.insertAt == null) {
        widgets.push(widget);
      } else {
        widgets.splice(
          Math.min(widgets.length, Math.max(0, widget.insertAt)),
          0,
          widget
        );
      }
      widget.line = line;
      if (cm && !lineIsHidden(doc, line)) {
        var aboveVisible = heightAtLine(line) < doc.scrollTop;
        updateLineHeight(line, line.height + widgetHeight(widget));
        if (aboveVisible) {
          addToScrollTop(cm, widget.height);
        }
        cm.curOp.forceUpdate = true;
      }
      return true;
    });
    if (cm) {
      signalLater(
        cm,
        "lineWidgetAdded",
        cm,
        widget,
        typeof handle == "number" ? handle : lineNo(handle)
      );
    }
    return widget;
  }

  // TEXTMARKERS

  // Created with markText and setBookmark methods. A TextMarker is a
  // handle that can be used to clear or find a marked position in the
  // document. Line objects hold arrays (markedSpans) containing
  // {from, to, marker} object pointing to such marker objects, and
  // indicating that such a marker is present on that line. Multiple
  // lines may point to the same marker when it spans across lines.
  // The spans will have null for their from/to properties when the
  // marker continues beyond the start/end of the line. Markers have
  // links back to the lines they currently touch.

  // Collapsed markers have unique ids, in order to be able to order
  // them, which is needed for uniquely determining an outer marker
  // when they overlap (they may nest, but not partially overlap).
  var nextMarkerId = 0;

  var TextMarker = function (doc, type) {
    this.lines = [];
    this.type = type;
    this.doc = doc;
    this.id = ++nextMarkerId;
  };

  // Clear the marker.
  TextMarker.prototype.clear = function () {
    if (this.explicitlyCleared) {
      return;
    }
    var cm = this.doc.cm,
      withOp = cm && !cm.curOp;
    if (withOp) {
      startOperation(cm);
    }
    if (hasHandler(this, "clear")) {
      var found = this.find();
      if (found) {
        signalLater(this, "clear", found.from, found.to);
      }
    }
    var min = null,
      max = null;
    for (var i = 0; i < this.lines.length; ++i) {
      var line = this.lines[i];
      var span = getMarkedSpanFor(line.markedSpans, this);
      if (cm && !this.collapsed) {
        regLineChange(cm, lineNo(line), "text");
      } else if (cm) {
        if (span.to != null) {
          max = lineNo(line);
        }
        if (span.from != null) {
          min = lineNo(line);
        }
      }
      line.markedSpans = removeMarkedSpan(line.markedSpans, span);
      if (
        span.from == null &&
        this.collapsed &&
        !lineIsHidden(this.doc, line) &&
        cm
      ) {
        updateLineHeight(line, textHeight(cm.display));
      }
    }
    if (cm && this.collapsed && !cm.options.lineWrapping) {
      for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
        var visual = visualLine(this.lines[i$1]),
          len = lineLength(visual);
        if (len > cm.display.maxLineLength) {
          cm.display.maxLine = visual;
          cm.display.maxLineLength = len;
          cm.display.maxLineChanged = true;
        }
      }
    }

    if (min != null && cm && this.collapsed) {
      regChange(cm, min, max + 1);
    }
    this.lines.length = 0;
    this.explicitlyCleared = true;
    if (this.atomic && this.doc.cantEdit) {
      this.doc.cantEdit = false;
      if (cm) {
        reCheckSelection(cm.doc);
      }
    }
    if (cm) {
      signalLater(cm, "markerCleared", cm, this, min, max);
    }
    if (withOp) {
      endOperation(cm);
    }
    if (this.parent) {
      this.parent.clear();
    }
  };

  // Find the position of the marker in the document. Returns a {from,
  // to} object by default. Side can be passed to get a specific side
  // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
  // Pos objects returned contain a line object, rather than a line
  // number (used to prevent looking up the same line twice).
  TextMarker.prototype.find = function (side, lineObj) {
    if (side == null && this.type == "bookmark") {
      side = 1;
    }
    var from, to;
    for (var i = 0; i < this.lines.length; ++i) {
      var line = this.lines[i];
      var span = getMarkedSpanFor(line.markedSpans, this);
      if (span.from != null) {
        from = Pos(lineObj ? line : lineNo(line), span.from);
        if (side == -1) {
          return from;
        }
      }
      if (span.to != null) {
        to = Pos(lineObj ? line : lineNo(line), span.to);
        if (side == 1) {
          return to;
        }
      }
    }
    return from && { from: from, to: to };
  };

  // Signals that the marker's widget changed, and surrounding layout
  // should be recomputed.
  TextMarker.prototype.changed = function () {
    var this$1 = this;

    var pos = this.find(-1, true),
      widget = this,
      cm = this.doc.cm;
    if (!pos || !cm) {
      return;
    }
    runInOp(cm, function () {
      var line = pos.line,
        lineN = lineNo(pos.line);
      var view = findViewForLine(cm, lineN);
      if (view) {
        clearLineMeasurementCacheFor(view);
        cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
      }
      cm.curOp.updateMaxLine = true;
      if (!lineIsHidden(widget.doc, line) && widget.height != null) {
        var oldHeight = widget.height;
        widget.height = null;
        var dHeight = widgetHeight(widget) - oldHeight;
        if (dHeight) {
          updateLineHeight(line, line.height + dHeight);
        }
      }
      signalLater(cm, "markerChanged", cm, this$1);
    });
  };

  TextMarker.prototype.attachLine = function (line) {
    if (!this.lines.length && this.doc.cm) {
      var op = this.doc.cm.curOp;
      if (
        !op.maybeHiddenMarkers ||
        indexOf(op.maybeHiddenMarkers, this) == -1
      ) {
        (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
      }
    }
    this.lines.push(line);
  };

  TextMarker.prototype.detachLine = function (line) {
    this.lines.splice(indexOf(this.lines, line), 1);
    if (!this.lines.length && this.doc.cm) {
      var op = this.doc.cm.curOp;
      (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
    }
  };
  eventMixin(TextMarker);

  // Create a marker, wire it up to the right lines, and
  function markText(doc, from, to, options, type) {
    // Shared markers (across linked documents) are handled separately
    // (markTextShared will call out to this again, once per
    // document).
    if (options && options.shared) {
      return markTextShared(doc, from, to, options, type);
    }
    // Ensure we are in an operation.
    if (doc.cm && !doc.cm.curOp) {
      return operation(doc.cm, markText)(doc, from, to, options, type);
    }

    var marker = new TextMarker(doc, type),
      diff = cmp(from, to);
    if (options) {
      copyObj(options, marker, false);
    }
    // Don't connect empty markers unless clearWhenEmpty is false
    if (diff > 0 || (diff == 0 && marker.clearWhenEmpty !== false)) {
      return marker;
    }
    if (marker.replacedWith) {
      // Showing up as a widget implies collapsed (widget replaces text)
      marker.collapsed = true;
      marker.widgetNode = eltP(
        "span",
        [marker.replacedWith],
        "CodeMirror-widget"
      );
      if (!options.handleMouseEvents) {
        marker.widgetNode.setAttribute("cm-ignore-events", "true");
      }
      if (options.insertLeft) {
        marker.widgetNode.insertLeft = true;
      }
    }
    if (marker.collapsed) {
      if (
        conflictingCollapsedRange(doc, from.line, from, to, marker) ||
        (from.line != to.line &&
          conflictingCollapsedRange(doc, to.line, from, to, marker))
      ) {
        throw new Error(
          "Inserting collapsed marker partially overlapping an existing one"
        );
      }
      seeCollapsedSpans();
    }

    if (marker.addToHistory) {
      addChangeToHistory(
        doc,
        { from: from, to: to, origin: "markText" },
        doc.sel,
        NaN
      );
    }

    var curLine = from.line,
      cm = doc.cm,
      updateMaxLine;
    doc.iter(curLine, to.line + 1, function (line) {
      if (
        cm &&
        marker.collapsed &&
        !cm.options.lineWrapping &&
        visualLine(line) == cm.display.maxLine
      ) {
        updateMaxLine = true;
      }
      if (marker.collapsed && curLine != from.line) {
        updateLineHeight(line, 0);
      }
      addMarkedSpan(
        line,
        new MarkedSpan(
          marker,
          curLine == from.line ? from.ch : null,
          curLine == to.line ? to.ch : null
        ),
        doc.cm && doc.cm.curOp
      );
      ++curLine;
    });
    // lineIsHidden depends on the presence of the spans, so needs a second pass
    if (marker.collapsed) {
      doc.iter(from.line, to.line + 1, function (line) {
        if (lineIsHidden(doc, line)) {
          updateLineHeight(line, 0);
        }
      });
    }

    if (marker.clearOnEnter) {
      on(marker, "beforeCursorEnter", function () {
        return marker.clear();
      });
    }

    if (marker.readOnly) {
      seeReadOnlySpans();
      if (doc.history.done.length || doc.history.undone.length) {
        doc.clearHistory();
      }
    }
    if (marker.collapsed) {
      marker.id = ++nextMarkerId;
      marker.atomic = true;
    }
    if (cm) {
      // Sync editor state
      if (updateMaxLine) {
        cm.curOp.updateMaxLine = true;
      }
      if (marker.collapsed) {
        regChange(cm, from.line, to.line + 1);
      } else if (
        marker.className ||
        marker.startStyle ||
        marker.endStyle ||
        marker.css ||
        marker.attributes ||
        marker.title
      ) {
        for (var i = from.line; i <= to.line; i++) {
          regLineChange(cm, i, "text");
        }
      }
      if (marker.atomic) {
        reCheckSelection(cm.doc);
      }
      signalLater(cm, "markerAdded", cm, marker);
    }
    return marker;
  }

  // SHARED TEXTMARKERS

  // A shared marker spans multiple linked documents. It is
  // implemented as a meta-marker-object controlling multiple normal
  // markers.
  var SharedTextMarker = function (markers, primary) {
    this.markers = markers;
    this.primary = primary;
    for (var i = 0; i < markers.length; ++i) {
      markers[i].parent = this;
    }
  };

  SharedTextMarker.prototype.clear = function () {
    if (this.explicitlyCleared) {
      return;
    }
    this.explicitlyCleared = true;
    for (var i = 0; i < this.markers.length; ++i) {
      this.markers[i].clear();
    }
    signalLater(this, "clear");
  };

  SharedTextMarker.prototype.find = function (side, lineObj) {
    return this.primary.find(side, lineObj);
  };
  eventMixin(SharedTextMarker);

  function markTextShared(doc, from, to, options, type) {
    options = copyObj(options);
    options.shared = false;
    var markers = [markText(doc, from, to, options, type)],
      primary = markers[0];
    var widget = options.widgetNode;
    linkedDocs(doc, function (doc) {
      if (widget) {
        options.widgetNode = widget.cloneNode(true);
      }
      markers.push(
        markText(doc, clipPos(doc, from), clipPos(doc, to), options, type)
      );
      for (var i = 0; i < doc.linked.length; ++i) {
        if (doc.linked[i].isParent) {
          return;
        }
      }
      primary = lst(markers);
    });
    return new SharedTextMarker(markers, primary);
  }

  function findSharedMarkers(doc) {
    return doc.findMarks(
      Pos(doc.first, 0),
      doc.clipPos(Pos(doc.lastLine())),
      function (m) {
        return m.parent;
      }
    );
  }

  function copySharedMarkers(doc, markers) {
    for (var i = 0; i < markers.length; i++) {
      var marker = markers[i],
        pos = marker.find();
      var mFrom = doc.clipPos(pos.from),
        mTo = doc.clipPos(pos.to);
      if (cmp(mFrom, mTo)) {
        var subMark = markText(
          doc,
          mFrom,
          mTo,
          marker.primary,
          marker.primary.type
        );
        marker.markers.push(subMark);
        subMark.parent = marker;
      }
    }
  }

  function detachSharedMarkers(markers) {
    var loop = function (i) {
      var marker = markers[i],
        linked = [marker.primary.doc];
      linkedDocs(marker.primary.doc, function (d) {
        return linked.push(d);
      });
      for (var j = 0; j < marker.markers.length; j++) {
        var subMarker = marker.markers[j];
        if (indexOf(linked, subMarker.doc) == -1) {
          subMarker.parent = null;
          marker.markers.splice(j--, 1);
        }
      }
    };

    for (var i = 0; i < markers.length; i++) loop(i);
  }

  var nextDocId = 0;
  var Doc = function (text, mode, firstLine, lineSep, direction) {
    if (!(this instanceof Doc)) {
      return new Doc(text, mode, firstLine, lineSep, direction);
    }
    if (firstLine == null) {
      firstLine = 0;
    }

    BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
    this.first = firstLine;
    this.scrollTop = this.scrollLeft = 0;
    this.cantEdit = false;
    this.cleanGeneration = 1;
    this.modeFrontier = this.highlightFrontier = firstLine;
    var start = Pos(firstLine, 0);
    this.sel = simpleSelection(start);
    this.history = new History(null);
    this.id = ++nextDocId;
    this.modeOption = mode;
    this.lineSep = lineSep;
    this.direction = direction == "rtl" ? "rtl" : "ltr";
    this.extend = false;

    if (typeof text == "string") {
      text = this.splitLines(text);
    }
    updateDoc(this, { from: start, to: start, text: text });
    setSelection(this, simpleSelection(start), sel_dontScroll);
  };

  Doc.prototype = createObj(BranchChunk.prototype, {
    constructor: Doc,
    // Iterate over the document. Supports two forms -- with only one
    // argument, it calls that for each line in the document. With
    // three, it iterates over the range given by the first two (with
    // the second being non-inclusive).
    iter: function (from, to, op) {
      if (op) {
        this.iterN(from - this.first, to - from, op);
      } else {
        this.iterN(this.first, this.first + this.size, from);
      }
    },

    // Non-public interface for adding and removing lines.
    insert: function (at, lines) {
      var height = 0;
      for (var i = 0; i < lines.length; ++i) {
        height += lines[i].height;
      }
      this.insertInner(at - this.first, lines, height);
    },
    remove: function (at, n) {
      this.removeInner(at - this.first, n);
    },

    // From here, the methods are part of the public interface. Most
    // are also available from CodeMirror (editor) instances.

    getValue: function (lineSep) {
      var lines = getLines(this, this.first, this.first + this.size);
      if (lineSep === false) {
        return lines;
      }
      return lines.join(lineSep || this.lineSeparator());
    },
    setValue: docMethodOp(function (code) {
      var top = Pos(this.first, 0),
        last = this.first + this.size - 1;
      makeChange(
        this,
        {
          from: top,
          to: Pos(last, getLine(this, last).text.length),
          text: this.splitLines(code),
          origin: "setValue",
          full: true,
        },
        true
      );
      if (this.cm) {
        scrollToCoords(this.cm, 0, 0);
      }
      setSelection(this, simpleSelection(top), sel_dontScroll);
    }),
    replaceRange: function (code, from, to, origin) {
      from = clipPos(this, from);
      to = to ? clipPos(this, to) : from;
      replaceRange(this, code, from, to, origin);
    },
    getRange: function (from, to, lineSep) {
      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
      if (lineSep === false) {
        return lines;
      }
      if (lineSep === "") {
        return lines.join("");
      }
      return lines.join(lineSep || this.lineSeparator());
    },

    getLine: function (line) {
      var l = this.getLineHandle(line);
      return l && l.text;
    },

    getLineHandle: function (line) {
      if (isLine(this, line)) {
        return getLine(this, line);
      }
    },
    getLineNumber: function (line) {
      return lineNo(line);
    },

    getLineHandleVisualStart: function (line) {
      if (typeof line == "number") {
        line = getLine(this, line);
      }
      return visualLine(line);
    },

    lineCount: function () {
      return this.size;
    },
    firstLine: function () {
      return this.first;
    },
    lastLine: function () {
      return this.first + this.size - 1;
    },

    clipPos: function (pos) {
      return clipPos(this, pos);
    },

    getCursor: function (start) {
      var range = this.sel.primary(),
        pos;
      if (start == null || start == "head") {
        pos = range.head;
      } else if (start == "anchor") {
        pos = range.anchor;
      } else if (start == "end" || start == "to" || start === false) {
        pos = range.to();
      } else {
        pos = range.from();
      }
      return pos;
    },
    listSelections: function () {
      return this.sel.ranges;
    },
    somethingSelected: function () {
      return this.sel.somethingSelected();
    },

    setCursor: docMethodOp(function (line, ch, options) {
      setSimpleSelection(
        this,
        clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line),
        null,
        options
      );
    }),
    setSelection: docMethodOp(function (anchor, head, options) {
      setSimpleSelection(
        this,
        clipPos(this, anchor),
        clipPos(this, head || anchor),
        options
      );
    }),
    extendSelection: docMethodOp(function (head, other, options) {
      extendSelection(
        this,
        clipPos(this, head),
        other && clipPos(this, other),
        options
      );
    }),
    extendSelections: docMethodOp(function (heads, options) {
      extendSelections(this, clipPosArray(this, heads), options);
    }),
    extendSelectionsBy: docMethodOp(function (f, options) {
      var heads = map(this.sel.ranges, f);
      extendSelections(this, clipPosArray(this, heads), options);
    }),
    setSelections: docMethodOp(function (ranges, primary, options) {
      if (!ranges.length) {
        return;
      }
      var out = [];
      for (var i = 0; i < ranges.length; i++) {
        out[i] = new Range(
          clipPos(this, ranges[i].anchor),
          clipPos(this, ranges[i].head || ranges[i].anchor)
        );
      }
      if (primary == null) {
        primary = Math.min(ranges.length - 1, this.sel.primIndex);
      }
      setSelection(this, normalizeSelection(this.cm, out, primary), options);
    }),
    addSelection: docMethodOp(function (anchor, head, options) {
      var ranges = this.sel.ranges.slice(0);
      ranges.push(
        new Range(clipPos(this, anchor), clipPos(this, head || anchor))
      );
      setSelection(
        this,
        normalizeSelection(this.cm, ranges, ranges.length - 1),
        options
      );
    }),

    getSelection: function (lineSep) {
      var ranges = this.sel.ranges,
        lines;
      for (var i = 0; i < ranges.length; i++) {
        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
        lines = lines ? lines.concat(sel) : sel;
      }
      if (lineSep === false) {
        return lines;
      } else {
        return lines.join(lineSep || this.lineSeparator());
      }
    },
    getSelections: function (lineSep) {
      var parts = [],
        ranges = this.sel.ranges;
      for (var i = 0; i < ranges.length; i++) {
        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
        if (lineSep !== false) {
          sel = sel.join(lineSep || this.lineSeparator());
        }
        parts[i] = sel;
      }
      return parts;
    },
    replaceSelection: function (code, collapse, origin) {
      var dup = [];
      for (var i = 0; i < this.sel.ranges.length; i++) {
        dup[i] = code;
      }
      this.replaceSelections(dup, collapse, origin || "+input");
    },
    replaceSelections: docMethodOp(function (code, collapse, origin) {
      var changes = [],
        sel = this.sel;
      for (var i = 0; i < sel.ranges.length; i++) {
        var range = sel.ranges[i];
        changes[i] = {
          from: range.from(),
          to: range.to(),
          text: this.splitLines(code[i]),
          origin: origin,
        };
      }
      var newSel =
        collapse &&
        collapse != "end" &&
        computeReplacedSel(this, changes, collapse);
      for (var i$1 = changes.length - 1; i$1 >= 0; i$1--) {
        makeChange(this, changes[i$1]);
      }
      if (newSel) {
        setSelectionReplaceHistory(this, newSel);
      } else if (this.cm) {
        ensureCursorVisible(this.cm);
      }
    }),
    undo: docMethodOp(function () {
      makeChangeFromHistory(this, "undo");
    }),
    redo: docMethodOp(function () {
      makeChangeFromHistory(this, "redo");
    }),
    undoSelection: docMethodOp(function () {
      makeChangeFromHistory(this, "undo", true);
    }),
    redoSelection: docMethodOp(function () {
      makeChangeFromHistory(this, "redo", true);
    }),

    setExtending: function (val) {
      this.extend = val;
    },
    getExtending: function () {
      return this.extend;
    },

    historySize: function () {
      var hist = this.history,
        done = 0,
        undone = 0;
      for (var i = 0; i < hist.done.length; i++) {
        if (!hist.done[i].ranges) {
          ++done;
        }
      }
      for (var i$1 = 0; i$1 < hist.undone.length; i$1++) {
        if (!hist.undone[i$1].ranges) {
          ++undone;
        }
      }
      return { undo: done, redo: undone };
    },
    clearHistory: function () {
      var this$1 = this;

      this.history = new History(this.history);
      linkedDocs(
        this,
        function (doc) {
          return (doc.history = this$1.history);
        },
        true
      );
    },

    markClean: function () {
      this.cleanGeneration = this.changeGeneration(true);
    },
    changeGeneration: function (forceSplit) {
      if (forceSplit) {
        this.history.lastOp =
          this.history.lastSelOp =
          this.history.lastOrigin =
            null;
      }
      return this.history.generation;
    },
    isClean: function (gen) {
      return this.history.generation == (gen || this.cleanGeneration);
    },

    getHistory: function () {
      return {
        done: copyHistoryArray(this.history.done),
        undone: copyHistoryArray(this.history.undone),
      };
    },
    setHistory: function (histData) {
      var hist = (this.history = new History(this.history));
      hist.done = copyHistoryArray(histData.done.slice(0), null, true);
      hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
    },

    setGutterMarker: docMethodOp(function (line, gutterID, value) {
      return changeLine(this, line, "gutter", function (line) {
        var markers = line.gutterMarkers || (line.gutterMarkers = {});
        markers[gutterID] = value;
        if (!value && isEmpty(markers)) {
          line.gutterMarkers = null;
        }
        return true;
      });
    }),

    clearGutter: docMethodOp(function (gutterID) {
      var this$1 = this;

      this.iter(function (line) {
        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
          changeLine(this$1, line, "gutter", function () {
            line.gutterMarkers[gutterID] = null;
            if (isEmpty(line.gutterMarkers)) {
              line.gutterMarkers = null;
            }
            return true;
          });
        }
      });
    }),

    lineInfo: function (line) {
      var n;
      if (typeof line == "number") {
        if (!isLine(this, line)) {
          return null;
        }
        n = line;
        line = getLine(this, line);
        if (!line) {
          return null;
        }
      } else {
        n = lineNo(line);
        if (n == null) {
          return null;
        }
      }
      return {
        line: n,
        handle: line,
        text: line.text,
        gutterMarkers: line.gutterMarkers,
        textClass: line.textClass,
        bgClass: line.bgClass,
        wrapClass: line.wrapClass,
        widgets: line.widgets,
      };
    },

    addLineClass: docMethodOp(function (handle, where, cls) {
      return changeLine(
        this,
        handle,
        where == "gutter" ? "gutter" : "class",
        function (line) {
          var prop =
            where == "text"
              ? "textClass"
              : where == "background"
              ? "bgClass"
              : where == "gutter"
              ? "gutterClass"
              : "wrapClass";
          if (!line[prop]) {
            line[prop] = cls;
          } else if (classTest(cls).test(line[prop])) {
            return false;
          } else {
            line[prop] += " " + cls;
          }
          return true;
        }
      );
    }),
    removeLineClass: docMethodOp(function (handle, where, cls) {
      return changeLine(
        this,
        handle,
        where == "gutter" ? "gutter" : "class",
        function (line) {
          var prop =
            where == "text"
              ? "textClass"
              : where == "background"
              ? "bgClass"
              : where == "gutter"
              ? "gutterClass"
              : "wrapClass";
          var cur = line[prop];
          if (!cur) {
            return false;
          } else if (cls == null) {
            line[prop] = null;
          } else {
            var found = cur.match(classTest(cls));
            if (!found) {
              return false;
            }
            var end = found.index + found[0].length;
            line[prop] =
              cur.slice(0, found.index) +
                (!found.index || end == cur.length ? "" : " ") +
                cur.slice(end) || null;
          }
          return true;
        }
      );
    }),

    addLineWidget: docMethodOp(function (handle, node, options) {
      return addLineWidget(this, handle, node, options);
    }),
    removeLineWidget: function (widget) {
      widget.clear();
    },

    markText: function (from, to, options) {
      return markText(
        this,
        clipPos(this, from),
        clipPos(this, to),
        options,
        (options && options.type) || "range"
      );
    },
    setBookmark: function (pos, options) {
      var realOpts = {
        replacedWith:
          options && (options.nodeType == null ? options.widget : options),
        insertLeft: options && options.insertLeft,
        clearWhenEmpty: false,
        shared: options && options.shared,
        handleMouseEvents: options && options.handleMouseEvents,
      };
      pos = clipPos(this, pos);
      return markText(this, pos, pos, realOpts, "bookmark");
    },
    findMarksAt: function (pos) {
      pos = clipPos(this, pos);
      var markers = [],
        spans = getLine(this, pos.line).markedSpans;
      if (spans) {
        for (var i = 0; i < spans.length; ++i) {
          var span = spans[i];
          if (
            (span.from == null || span.from <= pos.ch) &&
            (span.to == null || span.to >= pos.ch)
          ) {
            markers.push(span.marker.parent || span.marker);
          }
        }
      }
      return markers;
    },
    findMarks: function (from, to, filter) {
      from = clipPos(this, from);
      to = clipPos(this, to);
      var found = [],
        lineNo = from.line;
      this.iter(from.line, to.line + 1, function (line) {
        var spans = line.markedSpans;
        if (spans) {
          for (var i = 0; i < spans.length; i++) {
            var span = spans[i];
            if (
              !(
                (span.to != null &&
                  lineNo == from.line &&
                  from.ch >= span.to) ||
                (span.from == null && lineNo != from.line) ||
                (span.from != null && lineNo == to.line && span.from >= to.ch)
              ) &&
              (!filter || filter(span.marker))
            ) {
              found.push(span.marker.parent || span.marker);
            }
          }
        }
        ++lineNo;
      });
      return found;
    },
    getAllMarks: function () {
      var markers = [];
      this.iter(function (line) {
        var sps = line.markedSpans;
        if (sps) {
          for (var i = 0; i < sps.length; ++i) {
            if (sps[i].from != null) {
              markers.push(sps[i].marker);
            }
          }
        }
      });
      return markers;
    },

    posFromIndex: function (off) {
      var ch,
        lineNo = this.first,
        sepSize = this.lineSeparator().length;
      this.iter(function (line) {
        var sz = line.text.length + sepSize;
        if (sz > off) {
          ch = off;
          return true;
        }
        off -= sz;
        ++lineNo;
      });
      return clipPos(this, Pos(lineNo, ch));
    },
    indexFromPos: function (coords) {
      coords = clipPos(this, coords);
      var index = coords.ch;
      if (coords.line < this.first || coords.ch < 0) {
        return 0;
      }
      var sepSize = this.lineSeparator().length;
      this.iter(this.first, coords.line, function (line) {
        // iter aborts when callback returns a truthy value
        index += line.text.length + sepSize;
      });
      return index;
    },

    copy: function (copyHistory) {
      var doc = new Doc(
        getLines(this, this.first, this.first + this.size),
        this.modeOption,
        this.first,
        this.lineSep,
        this.direction
      );
      doc.scrollTop = this.scrollTop;
      doc.scrollLeft = this.scrollLeft;
      doc.sel = this.sel;
      doc.extend = false;
      if (copyHistory) {
        doc.history.undoDepth = this.history.undoDepth;
        doc.setHistory(this.getHistory());
      }
      return doc;
    },

    linkedDoc: function (options) {
      if (!options) {
        options = {};
      }
      var from = this.first,
        to = this.first + this.size;
      if (options.from != null && options.from > from) {
        from = options.from;
      }
      if (options.to != null && options.to < to) {
        to = options.to;
      }
      var copy = new Doc(
        getLines(this, from, to),
        options.mode || this.modeOption,
        from,
        this.lineSep,
        this.direction
      );
      if (options.sharedHist) {
        copy.history = this.history;
      }
      (this.linked || (this.linked = [])).push({
        doc: copy,
        sharedHist: options.sharedHist,
      });
      copy.linked = [
        { doc: this, isParent: true, sharedHist: options.sharedHist },
      ];
      copySharedMarkers(copy, findSharedMarkers(this));
      return copy;
    },
    unlinkDoc: function (other) {
      if (other instanceof CodeMirror) {
        other = other.doc;
      }
      if (this.linked) {
        for (var i = 0; i < this.linked.length; ++i) {
          var link = this.linked[i];
          if (link.doc != other) {
            continue;
          }
          this.linked.splice(i, 1);
          other.unlinkDoc(this);
          detachSharedMarkers(findSharedMarkers(this));
          break;
        }
      }
      // If the histories were shared, split them again
      if (other.history == this.history) {
        var splitIds = [other.id];
        linkedDocs(
          other,
          function (doc) {
            return splitIds.push(doc.id);
          },
          true
        );
        other.history = new History(null);
        other.history.done = copyHistoryArray(this.history.done, splitIds);
        other.history.undone = copyHistoryArray(this.history.undone, splitIds);
      }
    },
    iterLinkedDocs: function (f) {
      linkedDocs(this, f);
    },

    getMode: function () {
      return this.mode;
    },
    getEditor: function () {
      return this.cm;
    },

    splitLines: function (str) {
      if (this.lineSep) {
        return str.split(this.lineSep);
      }
      return splitLinesAuto(str);
    },
    lineSeparator: function () {
      return this.lineSep || "\n";
    },

    setDirection: docMethodOp(function (dir) {
      if (dir != "rtl") {
        dir = "ltr";
      }
      if (dir == this.direction) {
        return;
      }
      this.direction = dir;
      this.iter(function (line) {
        return (line.order = null);
      });
      if (this.cm) {
        directionChanged(this.cm);
      }
    }),
  });

  // Public alias.
  Doc.prototype.eachLine = Doc.prototype.iter;

  // Kludge to work around strange IE behavior where it'll sometimes
  // re-fire a series of drag-related events right after the drop (#1551)
  var lastDrop = 0;

  function onDrop(e) {
    var cm = this;
    clearDragCursor(cm);
    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
      return;
    }
    e_preventDefault(e);
    if (ie) {
      lastDrop = +new Date();
    }
    var pos = posFromMouse(cm, e, true),
      files = e.dataTransfer.files;
    if (!pos || cm.isReadOnly()) {
      return;
    }
    // Might be a file drop, in which case we simply extract the text
    // and insert it.
    if (files && files.length && window.FileReader && window.File) {
      var n = files.length,
        text = Array(n),
        read = 0;
      var markAsReadAndPasteIfAllFilesAreRead = function () {
        if (++read == n) {
          operation(cm, function () {
            pos = clipPos(cm.doc, pos);
            var change = {
              from: pos,
              to: pos,
              text: cm.doc.splitLines(
                text
                  .filter(function (t) {
                    return t != null;
                  })
                  .join(cm.doc.lineSeparator())
              ),
              origin: "paste",
            };
            makeChange(cm.doc, change);
            setSelectionReplaceHistory(
              cm.doc,
              simpleSelection(
                clipPos(cm.doc, pos),
                clipPos(cm.doc, changeEnd(change))
              )
            );
          })();
        }
      };
      var readTextFromFile = function (file, i) {
        if (
          cm.options.allowDropFileTypes &&
          indexOf(cm.options.allowDropFileTypes, file.type) == -1
        ) {
          markAsReadAndPasteIfAllFilesAreRead();
          return;
        }
        var reader = new FileReader();
        reader.onerror = function () {
          return markAsReadAndPasteIfAllFilesAreRead();
        };
        reader.onload = function () {
          var content = reader.result;
          if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) {
            markAsReadAndPasteIfAllFilesAreRead();
            return;
          }
          text[i] = content;
          markAsReadAndPasteIfAllFilesAreRead();
        };
        reader.readAsText(file);
      };
      for (var i = 0; i < files.length; i++) {
        readTextFromFile(files[i], i);
      }
    } else {
      // Normal drop
      // Don't do a replace if the drop happened inside of the selected text.
      if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
        cm.state.draggingText(e);
        // Ensure the editor is re-focused
        setTimeout(function () {
          return cm.display.input.focus();
        }, 20);
        return;
      }
      try {
        var text$1 = e.dataTransfer.getData("Text");
        if (text$1) {
          var selected;
          if (cm.state.draggingText && !cm.state.draggingText.copy) {
            selected = cm.listSelections();
          }
          setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
          if (selected) {
            for (var i$1 = 0; i$1 < selected.length; ++i$1) {
              replaceRange(
                cm.doc,
                "",
                selected[i$1].anchor,
                selected[i$1].head,
                "drag"
              );
            }
          }
          cm.replaceSelection(text$1, "around", "paste");
          cm.display.input.focus();
        }
      } catch (e$1) {}
    }
  }

  function onDragStart(cm, e) {
    if (ie && (!cm.state.draggingText || +new Date() - lastDrop < 100)) {
      e_stop(e);
      return;
    }
    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
      return;
    }

    e.dataTransfer.setData("Text", cm.getSelection());
    e.dataTransfer.effectAllowed = "copyMove";

    // Use dummy image instead of default browsers image.
    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
    if (e.dataTransfer.setDragImage && !safari) {
      var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
      img.src =
        "";
      if (presto) {
        img.width = img.height = 1;
        cm.display.wrapper.appendChild(img);
        // Force a relayout, or Opera won't use our image for some obscure reason
        img._top = img.offsetTop;
      }
      e.dataTransfer.setDragImage(img, 0, 0);
      if (presto) {
        img.parentNode.removeChild(img);
      }
    }
  }

  function onDragOver(cm, e) {
    var pos = posFromMouse(cm, e);
    if (!pos) {
      return;
    }
    var frag = document.createDocumentFragment();
    drawSelectionCursor(cm, pos, frag);
    if (!cm.display.dragCursor) {
      cm.display.dragCursor = elt(
        "div",
        null,
        "CodeMirror-cursors CodeMirror-dragcursors"
      );
      cm.display.lineSpace.insertBefore(
        cm.display.dragCursor,
        cm.display.cursorDiv
      );
    }
    removeChildrenAndAdd(cm.display.dragCursor, frag);
  }

  function clearDragCursor(cm) {
    if (cm.display.dragCursor) {
      cm.display.lineSpace.removeChild(cm.display.dragCursor);
      cm.display.dragCursor = null;
    }
  }

  // These must be handled carefully, because naively registering a
  // handler for each editor will cause the editors to never be
  // garbage collected.

  function forEachCodeMirror(f) {
    if (!document.getElementsByClassName) {
      return;
    }
    var byClass = document.getElementsByClassName("CodeMirror"),
      editors = [];
    for (var i = 0; i < byClass.length; i++) {
      var cm = byClass[i].CodeMirror;
      if (cm) {
        editors.push(cm);
      }
    }
    if (editors.length) {
      editors[0].operation(function () {
        for (var i = 0; i < editors.length; i++) {
          f(editors[i]);
        }
      });
    }
  }

  var globalsRegistered = false;
  function ensureGlobalHandlers() {
    if (globalsRegistered) {
      return;
    }
    registerGlobalHandlers();
    globalsRegistered = true;
  }
  function registerGlobalHandlers() {
    // When the window resizes, we need to refresh active editors.
    var resizeTimer;
    on(window, "resize", function () {
      if (resizeTimer == null) {
        resizeTimer = setTimeout(function () {
          resizeTimer = null;
          forEachCodeMirror(onResize);
        }, 100);
      }
    });
    // When the window loses focus, we want to show the editor as blurred
    on(window, "blur", function () {
      return forEachCodeMirror(onBlur);
    });
  }
  // Called when the window resizes
  function onResize(cm) {
    var d = cm.display;
    // Might be a text scaling operation, clear size caches.
    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
    d.scrollbarsClipped = false;
    cm.setSize();
  }

  var keyNames = {
    3: "Pause",
    8: "Backspace",
    9: "Tab",
    13: "Enter",
    16: "Shift",
    17: "Ctrl",
    18: "Alt",
    19: "Pause",
    20: "CapsLock",
    27: "Esc",
    32: "Space",
    33: "PageUp",
    34: "PageDown",
    35: "End",
    36: "Home",
    37: "Left",
    38: "Up",
    39: "Right",
    40: "Down",
    44: "PrintScrn",
    45: "Insert",
    46: "Delete",
    59: ";",
    61: "=",
    91: "Mod",
    92: "Mod",
    93: "Mod",
    106: "*",
    107: "=",
    109: "-",
    110: ".",
    111: "/",
    145: "ScrollLock",
    173: "-",
    186: ";",
    187: "=",
    188: ",",
    189: "-",
    190: ".",
    191: "/",
    192: "`",
    219: "[",
    220: "\\",
    221: "]",
    222: "'",
    224: "Mod",
    63232: "Up",
    63233: "Down",
    63234: "Left",
    63235: "Right",
    63272: "Delete",
    63273: "Home",
    63275: "End",
    63276: "PageUp",
    63277: "PageDown",
    63302: "Insert",
  };

  // Number keys
  for (var i = 0; i < 10; i++) {
    keyNames[i + 48] = keyNames[i + 96] = String(i);
  }
  // Alphabetic keys
  for (var i$1 = 65; i$1 <= 90; i$1++) {
    keyNames[i$1] = String.fromCharCode(i$1);
  }
  // Function keys
  for (var i$2 = 1; i$2 <= 12; i$2++) {
    keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2;
  }

  var keyMap = {};

  keyMap.basic = {
    Left: "goCharLeft",
    Right: "goCharRight",
    Up: "goLineUp",
    Down: "goLineDown",
    End: "goLineEnd",
    Home: "goLineStartSmart",
    PageUp: "goPageUp",
    PageDown: "goPageDown",
    Delete: "delCharAfter",
    Backspace: "delCharBefore",
    "Shift-Backspace": "delCharBefore",
    Tab: "defaultTab",
    "Shift-Tab": "indentAuto",
    Enter: "newlineAndIndent",
    Insert: "toggleOverwrite",
    Esc: "singleSelection",
  };
  // Note that the save and find-related commands aren't defined by
  // default. User code or addons can define them. Unknown commands
  // are simply ignored.
  keyMap.pcDefault = {
    "Ctrl-A": "selectAll",
    "Ctrl-D": "deleteLine",
    "Ctrl-Z": "undo",
    "Shift-Ctrl-Z": "redo",
    "Ctrl-Y": "redo",
    "Ctrl-Home": "goDocStart",
    "Ctrl-End": "goDocEnd",
    "Ctrl-Up": "goLineUp",
    "Ctrl-Down": "goLineDown",
    "Ctrl-Left": "goGroupLeft",
    "Ctrl-Right": "goGroupRight",
    "Alt-Left": "goLineStart",
    "Alt-Right": "goLineEnd",
    "Ctrl-Backspace": "delGroupBefore",
    "Ctrl-Delete": "delGroupAfter",
    "Ctrl-S": "save",
    "Ctrl-F": "find",
    "Ctrl-G": "findNext",
    "Shift-Ctrl-G": "findPrev",
    "Shift-Ctrl-F": "replace",
    "Shift-Ctrl-R": "replaceAll",
    "Ctrl-[": "indentLess",
    "Ctrl-]": "indentMore",
    "Ctrl-U": "undoSelection",
    "Shift-Ctrl-U": "redoSelection",
    "Alt-U": "redoSelection",
    fallthrough: "basic",
  };
  // Very basic readline/emacs-style bindings, which are standard on Mac.
  keyMap.emacsy = {
    "Ctrl-F": "goCharRight",
    "Ctrl-B": "goCharLeft",
    "Ctrl-P": "goLineUp",
    "Ctrl-N": "goLineDown",
    "Ctrl-A": "goLineStart",
    "Ctrl-E": "goLineEnd",
    "Ctrl-V": "goPageDown",
    "Shift-Ctrl-V": "goPageUp",
    "Ctrl-D": "delCharAfter",
    "Ctrl-H": "delCharBefore",
    "Alt-Backspace": "delWordBefore",
    "Ctrl-K": "killLine",
    "Ctrl-T": "transposeChars",
    "Ctrl-O": "openLine",
  };
  keyMap.macDefault = {
    "Cmd-A": "selectAll",
    "Cmd-D": "deleteLine",
    "Cmd-Z": "undo",
    "Shift-Cmd-Z": "redo",
    "Cmd-Y": "redo",
    "Cmd-Home": "goDocStart",
    "Cmd-Up": "goDocStart",
    "Cmd-End": "goDocEnd",
    "Cmd-Down": "goDocEnd",
    "Alt-Left": "goGroupLeft",
    "Alt-Right": "goGroupRight",
    "Cmd-Left": "goLineLeft",
    "Cmd-Right": "goLineRight",
    "Alt-Backspace": "delGroupBefore",
    "Ctrl-Alt-Backspace": "delGroupAfter",
    "Alt-Delete": "delGroupAfter",
    "Cmd-S": "save",
    "Cmd-F": "find",
    "Cmd-G": "findNext",
    "Shift-Cmd-G": "findPrev",
    "Cmd-Alt-F": "replace",
    "Shift-Cmd-Alt-F": "replaceAll",
    "Cmd-[": "indentLess",
    "Cmd-]": "indentMore",
    "Cmd-Backspace": "delWrappedLineLeft",
    "Cmd-Delete": "delWrappedLineRight",
    "Cmd-U": "undoSelection",
    "Shift-Cmd-U": "redoSelection",
    "Ctrl-Up": "goDocStart",
    "Ctrl-Down": "goDocEnd",
    fallthrough: ["basic", "emacsy"],
  };
  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;

  // KEYMAP DISPATCH

  function normalizeKeyName(name) {
    var parts = name.split(/-(?!$)/);
    name = parts[parts.length - 1];
    var alt, ctrl, shift, cmd;
    for (var i = 0; i < parts.length - 1; i++) {
      var mod = parts[i];
      if (/^(cmd|meta|m)$/i.test(mod)) {
        cmd = true;
      } else if (/^a(lt)?$/i.test(mod)) {
        alt = true;
      } else if (/^(c|ctrl|control)$/i.test(mod)) {
        ctrl = true;
      } else if (/^s(hift)?$/i.test(mod)) {
        shift = true;
      } else {
        throw new Error("Unrecognized modifier name: " + mod);
      }
    }
    if (alt) {
      name = "Alt-" + name;
    }
    if (ctrl) {
      name = "Ctrl-" + name;
    }
    if (cmd) {
      name = "Cmd-" + name;
    }
    if (shift) {
      name = "Shift-" + name;
    }
    return name;
  }

  // This is a kludge to keep keymaps mostly working as raw objects
  // (backwards compatibility) while at the same time support features
  // like normalization and multi-stroke key bindings. It compiles a
  // new normalized keymap, and then updates the old object to reflect
  // this.
  function normalizeKeyMap(keymap) {
    var copy = {};
    for (var keyname in keymap) {
      if (keymap.hasOwnProperty(keyname)) {
        var value = keymap[keyname];
        if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) {
          continue;
        }
        if (value == "...") {
          delete keymap[keyname];
          continue;
        }

        var keys = map(keyname.split(" "), normalizeKeyName);
        for (var i = 0; i < keys.length; i++) {
          var val = void 0,
            name = void 0;
          if (i == keys.length - 1) {
            name = keys.join(" ");
            val = value;
          } else {
            name = keys.slice(0, i + 1).join(" ");
            val = "...";
          }
          var prev = copy[name];
          if (!prev) {
            copy[name] = val;
          } else if (prev != val) {
            throw new Error("Inconsistent bindings for " + name);
          }
        }
        delete keymap[keyname];
      }
    }
    for (var prop in copy) {
      keymap[prop] = copy[prop];
    }
    return keymap;
  }

  function lookupKey(key, map, handle, context) {
    map = getKeyMap(map);
    var found = map.call ? map.call(key, context) : map[key];
    if (found === false) {
      return "nothing";
    }
    if (found === "...") {
      return "multi";
    }
    if (found != null && handle(found)) {
      return "handled";
    }

    if (map.fallthrough) {
      if (Object.prototype.toString.call(map.fallthrough) != "[object Array]") {
        return lookupKey(key, map.fallthrough, handle, context);
      }
      for (var i = 0; i < map.fallthrough.length; i++) {
        var result = lookupKey(key, map.fallthrough[i], handle, context);
        if (result) {
          return result;
        }
      }
    }
  }

  // Modifier key presses don't count as 'real' key presses for the
  // purpose of keymap fallthrough.
  function isModifierKey(value) {
    var name = typeof value == "string" ? value : keyNames[value.keyCode];
    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
  }

  function addModifierNames(name, event, noShift) {
    var base = name;
    if (event.altKey && base != "Alt") {
      name = "Alt-" + name;
    }
    if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") {
      name = "Ctrl-" + name;
    }
    if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Mod") {
      name = "Cmd-" + name;
    }
    if (!noShift && event.shiftKey && base != "Shift") {
      name = "Shift-" + name;
    }
    return name;
  }

  // Look up the name of a key as indicated by an event object.
  function keyName(event, noShift) {
    if (presto && event.keyCode == 34 && event["char"]) {
      return false;
    }
    var name = keyNames[event.keyCode];
    if (name == null || event.altGraphKey) {
      return false;
    }
    // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
    // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
    if (event.keyCode == 3 && event.code) {
      name = event.code;
    }
    return addModifierNames(name, event, noShift);
  }

  function getKeyMap(val) {
    return typeof val == "string" ? keyMap[val] : val;
  }

  // Helper for deleting text near the selection(s), used to implement
  // backspace, delete, and similar functionality.
  function deleteNearSelection(cm, compute) {
    var ranges = cm.doc.sel.ranges,
      kill = [];
    // Build up a set of ranges to kill first, merging overlapping
    // ranges.
    for (var i = 0; i < ranges.length; i++) {
      var toKill = compute(ranges[i]);
      while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
        var replaced = kill.pop();
        if (cmp(replaced.from, toKill.from) < 0) {
          toKill.from = replaced.from;
          break;
        }
      }
      kill.push(toKill);
    }
    // Next, remove those actual ranges.
    runInOp(cm, function () {
      for (var i = kill.length - 1; i >= 0; i--) {
        replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete");
      }
      ensureCursorVisible(cm);
    });
  }

  function moveCharLogically(line, ch, dir) {
    var target = skipExtendingChars(line.text, ch + dir, dir);
    return target < 0 || target > line.text.length ? null : target;
  }

  function moveLogically(line, start, dir) {
    var ch = moveCharLogically(line, start.ch, dir);
    return ch == null
      ? null
      : new Pos(start.line, ch, dir < 0 ? "after" : "before");
  }

  function endOfLine(visually, cm, lineObj, lineNo, dir) {
    if (visually) {
      if (cm.doc.direction == "rtl") {
        dir = -dir;
      }
      var order = getOrder(lineObj, cm.doc.direction);
      if (order) {
        var part = dir < 0 ? lst(order) : order[0];
        var moveInStorageOrder = dir < 0 == (part.level == 1);
        var sticky = moveInStorageOrder ? "after" : "before";
        var ch;
        // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
        // it could be that the last bidi part is not on the last visual line,
        // since visual lines contain content order-consecutive chunks.
        // Thus, in rtl, we are looking for the first (content-order) character
        // in the rtl chunk that is on the last line (that is, the same line
        // as the last (content-order) character).
        if (part.level > 0 || cm.doc.direction == "rtl") {
          var prep = prepareMeasureForLine(cm, lineObj);
          ch = dir < 0 ? lineObj.text.length - 1 : 0;
          var targetTop = measureCharPrepared(cm, prep, ch).top;
          ch = findFirst(
            function (ch) {
              return measureCharPrepared(cm, prep, ch).top == targetTop;
            },
            dir < 0 == (part.level == 1) ? part.from : part.to - 1,
            ch
          );
          if (sticky == "before") {
            ch = moveCharLogically(lineObj, ch, 1);
          }
        } else {
          ch = dir < 0 ? part.to : part.from;
        }
        return new Pos(lineNo, ch, sticky);
      }
    }
    return new Pos(
      lineNo,
      dir < 0 ? lineObj.text.length : 0,
      dir < 0 ? "before" : "after"
    );
  }

  function moveVisually(cm, line, start, dir) {
    var bidi = getOrder(line, cm.doc.direction);
    if (!bidi) {
      return moveLogically(line, start, dir);
    }
    if (start.ch >= line.text.length) {
      start.ch = line.text.length;
      start.sticky = "before";
    } else if (start.ch <= 0) {
      start.ch = 0;
      start.sticky = "after";
    }
    var partPos = getBidiPartAt(bidi, start.ch, start.sticky),
      part = bidi[partPos];
    if (
      cm.doc.direction == "ltr" &&
      part.level % 2 == 0 &&
      (dir > 0 ? part.to > start.ch : part.from < start.ch)
    ) {
      // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
      // nothing interesting happens.
      return moveLogically(line, start, dir);
    }

    var mv = function (pos, dir) {
      return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir);
    };
    var prep;
    var getWrappedLineExtent = function (ch) {
      if (!cm.options.lineWrapping) {
        return { begin: 0, end: line.text.length };
      }
      prep = prep || prepareMeasureForLine(cm, line);
      return wrappedLineExtentChar(cm, line, prep, ch);
    };
    var wrappedLineExtent = getWrappedLineExtent(
      start.sticky == "before" ? mv(start, -1) : start.ch
    );

    if (cm.doc.direction == "rtl" || part.level == 1) {
      var moveInStorageOrder = (part.level == 1) == dir < 0;
      var ch = mv(start, moveInStorageOrder ? 1 : -1);
      if (
        ch != null &&
        (!moveInStorageOrder
          ? ch >= part.from && ch >= wrappedLineExtent.begin
          : ch <= part.to && ch <= wrappedLineExtent.end)
      ) {
        // Case 2: We move within an rtl part or in an rtl editor on the same visual line
        var sticky = moveInStorageOrder ? "before" : "after";
        return new Pos(start.line, ch, sticky);
      }
    }

    // Case 3: Could not move within this bidi part in this visual line, so leave
    // the current bidi part

    var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {
      var getRes = function (ch, moveInStorageOrder) {
        return moveInStorageOrder
          ? new Pos(start.line, mv(ch, 1), "before")
          : new Pos(start.line, ch, "after");
      };

      for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
        var part = bidi[partPos];
        var moveInStorageOrder = dir > 0 == (part.level != 1);
        var ch = moveInStorageOrder
          ? wrappedLineExtent.begin
          : mv(wrappedLineExtent.end, -1);
        if (part.from <= ch && ch < part.to) {
          return getRes(ch, moveInStorageOrder);
        }
        ch = moveInStorageOrder ? part.from : mv(part.to, -1);
        if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) {
          return getRes(ch, moveInStorageOrder);
        }
      }
    };

    // Case 3a: Look for other bidi parts on the same visual line
    var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);
    if (res) {
      return res;
    }

    // Case 3b: Look for other bidi parts on the next visual line
    var nextCh =
      dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);
    if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
      res = searchInVisualLine(
        dir > 0 ? 0 : bidi.length - 1,
        dir,
        getWrappedLineExtent(nextCh)
      );
      if (res) {
        return res;
      }
    }

    // Case 4: Nowhere to move
    return null;
  }

  // Commands are parameter-less actions that can be performed on an
  // editor, mostly used for keybindings.
  var commands = {
    selectAll: selectAll,
    singleSelection: function (cm) {
      return cm.setSelection(
        cm.getCursor("anchor"),
        cm.getCursor("head"),
        sel_dontScroll
      );
    },
    killLine: function (cm) {
      return deleteNearSelection(cm, function (range) {
        if (range.empty()) {
          var len = getLine(cm.doc, range.head.line).text.length;
          if (range.head.ch == len && range.head.line < cm.lastLine()) {
            return { from: range.head, to: Pos(range.head.line + 1, 0) };
          } else {
            return { from: range.head, to: Pos(range.head.line, len) };
          }
        } else {
          return { from: range.from(), to: range.to() };
        }
      });
    },
    deleteLine: function (cm) {
      return deleteNearSelection(cm, function (range) {
        return {
          from: Pos(range.from().line, 0),
          to: clipPos(cm.doc, Pos(range.to().line + 1, 0)),
        };
      });
    },
    delLineLeft: function (cm) {
      return deleteNearSelection(cm, function (range) {
        return {
          from: Pos(range.from().line, 0),
          to: range.from(),
        };
      });
    },
    delWrappedLineLeft: function (cm) {
      return deleteNearSelection(cm, function (range) {
        var top = cm.charCoords(range.head, "div").top + 5;
        var leftPos = cm.coordsChar({ left: 0, top: top }, "div");
        return { from: leftPos, to: range.from() };
      });
    },
    delWrappedLineRight: function (cm) {
      return deleteNearSelection(cm, function (range) {
        var top = cm.charCoords(range.head, "div").top + 5;
        var rightPos = cm.coordsChar(
          { left: cm.display.lineDiv.offsetWidth + 100, top: top },
          "div"
        );
        return { from: range.from(), to: rightPos };
      });
    },
    undo: function (cm) {
      return cm.undo();
    },
    redo: function (cm) {
      return cm.redo();
    },
    undoSelection: function (cm) {
      return cm.undoSelection();
    },
    redoSelection: function (cm) {
      return cm.redoSelection();
    },
    goDocStart: function (cm) {
      return cm.extendSelection(Pos(cm.firstLine(), 0));
    },
    goDocEnd: function (cm) {
      return cm.extendSelection(Pos(cm.lastLine()));
    },
    goLineStart: function (cm) {
      return cm.extendSelectionsBy(
        function (range) {
          return lineStart(cm, range.head.line);
        },
        { origin: "+move", bias: 1 }
      );
    },
    goLineStartSmart: function (cm) {
      return cm.extendSelectionsBy(
        function (range) {
          return lineStartSmart(cm, range.head);
        },
        { origin: "+move", bias: 1 }
      );
    },
    goLineEnd: function (cm) {
      return cm.extendSelectionsBy(
        function (range) {
          return lineEnd(cm, range.head.line);
        },
        { origin: "+move", bias: -1 }
      );
    },
    goLineRight: function (cm) {
      return cm.extendSelectionsBy(function (range) {
        var top = cm.cursorCoords(range.head, "div").top + 5;
        return cm.coordsChar(
          { left: cm.display.lineDiv.offsetWidth + 100, top: top },
          "div"
        );
      }, sel_move);
    },
    goLineLeft: function (cm) {
      return cm.extendSelectionsBy(function (range) {
        var top = cm.cursorCoords(range.head, "div").top + 5;
        return cm.coordsChar({ left: 0, top: top }, "div");
      }, sel_move);
    },
    goLineLeftSmart: function (cm) {
      return cm.extendSelectionsBy(function (range) {
        var top = cm.cursorCoords(range.head, "div").top + 5;
        var pos = cm.coordsChar({ left: 0, top: top }, "div");
        if (pos.ch < cm.getLine(pos.line).search(/\S/)) {
          return lineStartSmart(cm, range.head);
        }
        return pos;
      }, sel_move);
    },
    goLineUp: function (cm) {
      return cm.moveV(-1, "line");
    },
    goLineDown: function (cm) {
      return cm.moveV(1, "line");
    },
    goPageUp: function (cm) {
      return cm.moveV(-1, "page");
    },
    goPageDown: function (cm) {
      return cm.moveV(1, "page");
    },
    goCharLeft: function (cm) {
      return cm.moveH(-1, "char");
    },
    goCharRight: function (cm) {
      return cm.moveH(1, "char");
    },
    goColumnLeft: function (cm) {
      return cm.moveH(-1, "column");
    },
    goColumnRight: function (cm) {
      return cm.moveH(1, "column");
    },
    goWordLeft: function (cm) {
      return cm.moveH(-1, "word");
    },
    goGroupRight: function (cm) {
      return cm.moveH(1, "group");
    },
    goGroupLeft: function (cm) {
      return cm.moveH(-1, "group");
    },
    goWordRight: function (cm) {
      return cm.moveH(1, "word");
    },
    delCharBefore: function (cm) {
      return cm.deleteH(-1, "codepoint");
    },
    delCharAfter: function (cm) {
      return cm.deleteH(1, "char");
    },
    delWordBefore: function (cm) {
      return cm.deleteH(-1, "word");
    },
    delWordAfter: function (cm) {
      return cm.deleteH(1, "word");
    },
    delGroupBefore: function (cm) {
      return cm.deleteH(-1, "group");
    },
    delGroupAfter: function (cm) {
      return cm.deleteH(1, "group");
    },
    indentAuto: function (cm) {
      return cm.indentSelection("smart");
    },
    indentMore: function (cm) {
      return cm.indentSelection("add");
    },
    indentLess: function (cm) {
      return cm.indentSelection("subtract");
    },
    insertTab: function (cm) {
      return cm.replaceSelection("\t");
    },
    insertSoftTab: function (cm) {
      var spaces = [],
        ranges = cm.listSelections(),
        tabSize = cm.options.tabSize;
      for (var i = 0; i < ranges.length; i++) {
        var pos = ranges[i].from();
        var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
        spaces.push(spaceStr(tabSize - (col % tabSize)));
      }
      cm.replaceSelections(spaces);
    },
    defaultTab: function (cm) {
      if (cm.somethingSelected()) {
        cm.indentSelection("add");
      } else {
        cm.execCommand("insertTab");
      }
    },
    // Swap the two chars left and right of each selection's head.
    // Move cursor behind the two swapped characters afterwards.
    //
    // Doesn't consider line feeds a character.
    // Doesn't scan more than one line above to find a character.
    // Doesn't do anything on an empty line.
    // Doesn't do anything with non-empty selections.
    transposeChars: function (cm) {
      return runInOp(cm, function () {
        var ranges = cm.listSelections(),
          newSel = [];
        for (var i = 0; i < ranges.length; i++) {
          if (!ranges[i].empty()) {
            continue;
          }
          var cur = ranges[i].head,
            line = getLine(cm.doc, cur.line).text;
          if (line) {
            if (cur.ch == line.length) {
              cur = new Pos(cur.line, cur.ch - 1);
            }
            if (cur.ch > 0) {
              cur = new Pos(cur.line, cur.ch + 1);
              cm.replaceRange(
                line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
                Pos(cur.line, cur.ch - 2),
                cur,
                "+transpose"
              );
            } else if (cur.line > cm.doc.first) {
              var prev = getLine(cm.doc, cur.line - 1).text;
              if (prev) {
                cur = new Pos(cur.line, 1);
                cm.replaceRange(
                  line.charAt(0) +
                    cm.doc.lineSeparator() +
                    prev.charAt(prev.length - 1),
                  Pos(cur.line - 1, prev.length - 1),
                  cur,
                  "+transpose"
                );
              }
            }
          }
          newSel.push(new Range(cur, cur));
        }
        cm.setSelections(newSel);
      });
    },
    newlineAndIndent: function (cm) {
      return runInOp(cm, function () {
        var sels = cm.listSelections();
        for (var i = sels.length - 1; i >= 0; i--) {
          cm.replaceRange(
            cm.doc.lineSeparator(),
            sels[i].anchor,
            sels[i].head,
            "+input"
          );
        }
        sels = cm.listSelections();
        for (var i$1 = 0; i$1 < sels.length; i$1++) {
          cm.indentLine(sels[i$1].from().line, null, true);
        }
        ensureCursorVisible(cm);
      });
    },
    openLine: function (cm) {
      return cm.replaceSelection("\n", "start");
    },
    toggleOverwrite: function (cm) {
      return cm.toggleOverwrite();
    },
  };

  function lineStart(cm, lineN) {
    var line = getLine(cm.doc, lineN);
    var visual = visualLine(line);
    if (visual != line) {
      lineN = lineNo(visual);
    }
    return endOfLine(true, cm, visual, lineN, 1);
  }
  function lineEnd(cm, lineN) {
    var line = getLine(cm.doc, lineN);
    var visual = visualLineEnd(line);
    if (visual != line) {
      lineN = lineNo(visual);
    }
    return endOfLine(true, cm, line, lineN, -1);
  }
  function lineStartSmart(cm, pos) {
    var start = lineStart(cm, pos.line);
    var line = getLine(cm.doc, start.line);
    var order = getOrder(line, cm.doc.direction);
    if (!order || order[0].level == 0) {
      var firstNonWS = Math.max(start.ch, line.text.search(/\S/));
      var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
      return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky);
    }
    return start;
  }

  // Run a handler that was bound to a key.
  function doHandleBinding(cm, bound, dropShift) {
    if (typeof bound == "string") {
      bound = commands[bound];
      if (!bound) {
        return false;
      }
    }
    // Ensure previous input has been read, so that the handler sees a
    // consistent view of the document
    cm.display.input.ensurePolled();
    var prevShift = cm.display.shift,
      done = false;
    try {
      if (cm.isReadOnly()) {
        cm.state.suppressEdits = true;
      }
      if (dropShift) {
        cm.display.shift = false;
      }
      done = bound(cm) != Pass;
    } finally {
      cm.display.shift = prevShift;
      cm.state.suppressEdits = false;
    }
    return done;
  }

  function lookupKeyForEditor(cm, name, handle) {
    for (var i = 0; i < cm.state.keyMaps.length; i++) {
      var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
      if (result) {
        return result;
      }
    }
    return (
      (cm.options.extraKeys &&
        lookupKey(name, cm.options.extraKeys, handle, cm)) ||
      lookupKey(name, cm.options.keyMap, handle, cm)
    );
  }

  // Note that, despite the name, this function is also used to check
  // for bound mouse clicks.

  var stopSeq = new Delayed();

  function dispatchKey(cm, name, e, handle) {
    var seq = cm.state.keySeq;
    if (seq) {
      if (isModifierKey(name)) {
        return "handled";
      }
      if (/\'$/.test(name)) {
        cm.state.keySeq = null;
      } else {
        stopSeq.set(50, function () {
          if (cm.state.keySeq == seq) {
            cm.state.keySeq = null;
            cm.display.input.reset();
          }
        });
      }
      if (dispatchKeyInner(cm, seq + " " + name, e, handle)) {
        return true;
      }
    }
    return dispatchKeyInner(cm, name, e, handle);
  }

  function dispatchKeyInner(cm, name, e, handle) {
    var result = lookupKeyForEditor(cm, name, handle);

    if (result == "multi") {
      cm.state.keySeq = name;
    }
    if (result == "handled") {
      signalLater(cm, "keyHandled", cm, name, e);
    }

    if (result == "handled" || result == "multi") {
      e_preventDefault(e);
      restartBlink(cm);
    }

    return !!result;
  }

  // Handle a key from the keydown event.
  function handleKeyBinding(cm, e) {
    var name = keyName(e, true);
    if (!name) {
      return false;
    }

    if (e.shiftKey && !cm.state.keySeq) {
      // First try to resolve full name (including 'Shift-'). Failing
      // that, see if there is a cursor-motion command (starting with
      // 'go') bound to the keyname without 'Shift-'.
      return (
        dispatchKey(cm, "Shift-" + name, e, function (b) {
          return doHandleBinding(cm, b, true);
        }) ||
        dispatchKey(cm, name, e, function (b) {
          if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion) {
            return doHandleBinding(cm, b);
          }
        })
      );
    } else {
      return dispatchKey(cm, name, e, function (b) {
        return doHandleBinding(cm, b);
      });
    }
  }

  // Handle a key from the keypress event
  function handleCharBinding(cm, e, ch) {
    return dispatchKey(cm, "'" + ch + "'", e, function (b) {
      return doHandleBinding(cm, b, true);
    });
  }

  var lastStoppedKey = null;
  function onKeyDown(e) {
    var cm = this;
    if (e.target && e.target != cm.display.input.getField()) {
      return;
    }
    cm.curOp.focus = activeElt();
    if (signalDOMEvent(cm, e)) {
      return;
    }
    // IE does strange things with escape.
    if (ie && ie_version < 11 && e.keyCode == 27) {
      e.returnValue = false;
    }
    var code = e.keyCode;
    cm.display.shift = code == 16 || e.shiftKey;
    var handled = handleKeyBinding(cm, e);
    if (presto) {
      lastStoppedKey = handled ? code : null;
      // Opera has no cut event... we try to at least catch the key combo
      if (
        !handled &&
        code == 88 &&
        !hasCopyEvent &&
        (mac ? e.metaKey : e.ctrlKey)
      ) {
        cm.replaceSelection("", null, "cut");
      }
    }
    if (
      gecko &&
      !mac &&
      !handled &&
      code == 46 &&
      e.shiftKey &&
      !e.ctrlKey &&
      document.execCommand
    ) {
      document.execCommand("cut");
    }

    // Turn mouse into crosshair when Alt is held on Mac.
    if (
      code == 18 &&
      !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className)
    ) {
      showCrossHair(cm);
    }
  }

  function showCrossHair(cm) {
    var lineDiv = cm.display.lineDiv;
    addClass(lineDiv, "CodeMirror-crosshair");

    function up(e) {
      if (e.keyCode == 18 || !e.altKey) {
        rmClass(lineDiv, "CodeMirror-crosshair");
        off(document, "keyup", up);
        off(document, "mouseover", up);
      }
    }
    on(document, "keyup", up);
    on(document, "mouseover", up);
  }

  function onKeyUp(e) {
    if (e.keyCode == 16) {
      this.doc.sel.shift = false;
    }
    signalDOMEvent(this, e);
  }

  function onKeyPress(e) {
    var cm = this;
    if (e.target && e.target != cm.display.input.getField()) {
      return;
    }
    if (
      eventInWidget(cm.display, e) ||
      signalDOMEvent(cm, e) ||
      (e.ctrlKey && !e.altKey) ||
      (mac && e.metaKey)
    ) {
      return;
    }
    var keyCode = e.keyCode,
      charCode = e.charCode;
    if (presto && keyCode == lastStoppedKey) {
      lastStoppedKey = null;
      e_preventDefault(e);
      return;
    }
    if (presto && (!e.which || e.which < 10) && handleKeyBinding(cm, e)) {
      return;
    }
    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
    // Some browsers fire keypress events for backspace
    if (ch == "\x08") {
      return;
    }
    if (handleCharBinding(cm, e, ch)) {
      return;
    }
    cm.display.input.onKeyPress(e);
  }

  var DOUBLECLICK_DELAY = 400;

  var PastClick = function (time, pos, button) {
    this.time = time;
    this.pos = pos;
    this.button = button;
  };

  PastClick.prototype.compare = function (time, pos, button) {
    return (
      this.time + DOUBLECLICK_DELAY > time &&
      cmp(pos, this.pos) == 0 &&
      button == this.button
    );
  };

  var lastClick, lastDoubleClick;
  function clickRepeat(pos, button) {
    var now = +new Date();
    if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
      lastClick = lastDoubleClick = null;
      return "triple";
    } else if (lastClick && lastClick.compare(now, pos, button)) {
      lastDoubleClick = new PastClick(now, pos, button);
      lastClick = null;
      return "double";
    } else {
      lastClick = new PastClick(now, pos, button);
      lastDoubleClick = null;
      return "single";
    }
  }

  // A mouse down can be a single click, double click, triple click,
  // start of selection drag, start of text drag, new cursor
  // (ctrl-click), rectangle drag (alt-drag), or xwin
  // middle-click-paste. Or it might be a click on something we should
  // not interfere with, such as a scrollbar or widget.
  function onMouseDown(e) {
    var cm = this,
      display = cm.display;
    if (
      signalDOMEvent(cm, e) ||
      (display.activeTouch && display.input.supportsTouch())
    ) {
      return;
    }
    display.input.ensurePolled();
    display.shift = e.shiftKey;

    if (eventInWidget(display, e)) {
      if (!webkit) {
        // Briefly turn off draggability, to allow widgets to do
        // normal dragging things.
        display.scroller.draggable = false;
        setTimeout(function () {
          return (display.scroller.draggable = true);
        }, 100);
      }
      return;
    }
    if (clickInGutter(cm, e)) {
      return;
    }
    var pos = posFromMouse(cm, e),
      button = e_button(e),
      repeat = pos ? clickRepeat(pos, button) : "single";
    window.focus();

    // #3261: make sure, that we're not starting a second selection
    if (button == 1 && cm.state.selectingText) {
      cm.state.selectingText(e);
    }

    if (pos && handleMappedButton(cm, button, pos, repeat, e)) {
      return;
    }

    if (button == 1) {
      if (pos) {
        leftButtonDown(cm, pos, repeat, e);
      } else if (e_target(e) == display.scroller) {
        e_preventDefault(e);
      }
    } else if (button == 2) {
      if (pos) {
        extendSelection(cm.doc, pos);
      }
      setTimeout(function () {
        return display.input.focus();
      }, 20);
    } else if (button == 3) {
      if (captureRightClick) {
        cm.display.input.onContextMenu(e);
      } else {
        delayBlurEvent(cm);
      }
    }
  }

  function handleMappedButton(cm, button, pos, repeat, event) {
    var name = "Click";
    if (repeat == "double") {
      name = "Double" + name;
    } else if (repeat == "triple") {
      name = "Triple" + name;
    }
    name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name;

    return dispatchKey(
      cm,
      addModifierNames(name, event),
      event,
      function (bound) {
        if (typeof bound == "string") {
          bound = commands[bound];
        }
        if (!bound) {
          return false;
        }
        var done = false;
        try {
          if (cm.isReadOnly()) {
            cm.state.suppressEdits = true;
          }
          done = bound(cm, pos) != Pass;
        } finally {
          cm.state.suppressEdits = false;
        }
        return done;
      }
    );
  }

  function configureMouse(cm, repeat, event) {
    var option = cm.getOption("configureMouse");
    var value = option ? option(cm, repeat, event) : {};
    if (value.unit == null) {
      var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;
      value.unit = rect
        ? "rectangle"
        : repeat == "single"
        ? "char"
        : repeat == "double"
        ? "word"
        : "line";
    }
    if (value.extend == null || cm.doc.extend) {
      value.extend = cm.doc.extend || event.shiftKey;
    }
    if (value.addNew == null) {
      value.addNew = mac ? event.metaKey : event.ctrlKey;
    }
    if (value.moveOnDrag == null) {
      value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey);
    }
    return value;
  }

  function leftButtonDown(cm, pos, repeat, event) {
    if (ie) {
      setTimeout(bind(ensureFocus, cm), 0);
    } else {
      cm.curOp.focus = activeElt();
    }

    var behavior = configureMouse(cm, repeat, event);

    var sel = cm.doc.sel,
      contained;
    if (
      cm.options.dragDrop &&
      dragAndDrop &&
      !cm.isReadOnly() &&
      repeat == "single" &&
      (contained = sel.contains(pos)) > -1 &&
      (cmp((contained = sel.ranges[contained]).from(), pos) < 0 ||
        pos.xRel > 0) &&
      (cmp(contained.to(), pos) > 0 || pos.xRel < 0)
    ) {
      leftButtonStartDrag(cm, event, pos, behavior);
    } else {
      leftButtonSelect(cm, event, pos, behavior);
    }
  }

  // Start a text drag. When it ends, see if any dragging actually
  // happen, and treat as a click if it didn't.
  function leftButtonStartDrag(cm, event, pos, behavior) {
    var display = cm.display,
      moved = false;
    var dragEnd = operation(cm, function (e) {
      if (webkit) {
        display.scroller.draggable = false;
      }
      cm.state.draggingText = false;
      if (cm.state.delayingBlurEvent) {
        if (cm.hasFocus()) {
          cm.state.delayingBlurEvent = false;
        } else {
          delayBlurEvent(cm);
        }
      }
      off(display.wrapper.ownerDocument, "mouseup", dragEnd);
      off(display.wrapper.ownerDocument, "mousemove", mouseMove);
      off(display.scroller, "dragstart", dragStart);
      off(display.scroller, "drop", dragEnd);
      if (!moved) {
        e_preventDefault(e);
        if (!behavior.addNew) {
          extendSelection(cm.doc, pos, null, null, behavior.extend);
        }
        // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
        if ((webkit && !safari) || (ie && ie_version == 9)) {
          setTimeout(function () {
            display.wrapper.ownerDocument.body.focus({ preventScroll: true });
            display.input.focus();
          }, 20);
        } else {
          display.input.focus();
        }
      }
    });
    var mouseMove = function (e2) {
      moved =
        moved ||
        Math.abs(event.clientX - e2.clientX) +
          Math.abs(event.clientY - e2.clientY) >=
          10;
    };
    var dragStart = function () {
      return (moved = true);
    };
    // Let the drag handler handle this.
    if (webkit) {
      display.scroller.draggable = true;
    }
    cm.state.draggingText = dragEnd;
    dragEnd.copy = !behavior.moveOnDrag;
    on(display.wrapper.ownerDocument, "mouseup", dragEnd);
    on(display.wrapper.ownerDocument, "mousemove", mouseMove);
    on(display.scroller, "dragstart", dragStart);
    on(display.scroller, "drop", dragEnd);

    cm.state.delayingBlurEvent = true;
    setTimeout(function () {
      return display.input.focus();
    }, 20);
    // IE's approach to draggable
    if (display.scroller.dragDrop) {
      display.scroller.dragDrop();
    }
  }

  function rangeForUnit(cm, pos, unit) {
    if (unit == "char") {
      return new Range(pos, pos);
    }
    if (unit == "word") {
      return cm.findWordAt(pos);
    }
    if (unit == "line") {
      return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)));
    }
    var result = unit(cm, pos);
    return new Range(result.from, result.to);
  }

  // Normal selection, as opposed to text dragging.
  function leftButtonSelect(cm, event, start, behavior) {
    if (ie) {
      delayBlurEvent(cm);
    }
    var display = cm.display,
      doc = cm.doc;
    e_preventDefault(event);

    var ourRange,
      ourIndex,
      startSel = doc.sel,
      ranges = startSel.ranges;
    if (behavior.addNew && !behavior.extend) {
      ourIndex = doc.sel.contains(start);
      if (ourIndex > -1) {
        ourRange = ranges[ourIndex];
      } else {
        ourRange = new Range(start, start);
      }
    } else {
      ourRange = doc.sel.primary();
      ourIndex = doc.sel.primIndex;
    }

    if (behavior.unit == "rectangle") {
      if (!behavior.addNew) {
        ourRange = new Range(start, start);
      }
      start = posFromMouse(cm, event, true, true);
      ourIndex = -1;
    } else {
      var range = rangeForUnit(cm, start, behavior.unit);
      if (behavior.extend) {
        ourRange = extendRange(
          ourRange,
          range.anchor,
          range.head,
          behavior.extend
        );
      } else {
        ourRange = range;
      }
    }

    if (!behavior.addNew) {
      ourIndex = 0;
      setSelection(doc, new Selection([ourRange], 0), sel_mouse);
      startSel = doc.sel;
    } else if (ourIndex == -1) {
      ourIndex = ranges.length;
      setSelection(
        doc,
        normalizeSelection(cm, ranges.concat([ourRange]), ourIndex),
        { scroll: false, origin: "*mouse" }
      );
    } else if (
      ranges.length > 1 &&
      ranges[ourIndex].empty() &&
      behavior.unit == "char" &&
      !behavior.extend
    ) {
      setSelection(
        doc,
        normalizeSelection(
          cm,
          ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)),
          0
        ),
        { scroll: false, origin: "*mouse" }
      );
      startSel = doc.sel;
    } else {
      replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
    }

    var lastPos = start;
    function extendTo(pos) {
      if (cmp(lastPos, pos) == 0) {
        return;
      }
      lastPos = pos;

      if (behavior.unit == "rectangle") {
        var ranges = [],
          tabSize = cm.options.tabSize;
        var startCol = countColumn(
          getLine(doc, start.line).text,
          start.ch,
          tabSize
        );
        var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
        var left = Math.min(startCol, posCol),
          right = Math.max(startCol, posCol);
        for (
          var line = Math.min(start.line, pos.line),
            end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
          line <= end;
          line++
        ) {
          var text = getLine(doc, line).text,
            leftPos = findColumn(text, left, tabSize);
          if (left == right) {
            ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)));
          } else if (text.length > leftPos) {
            ranges.push(
              new Range(
                Pos(line, leftPos),
                Pos(line, findColumn(text, right, tabSize))
              )
            );
          }
        }
        if (!ranges.length) {
          ranges.push(new Range(start, start));
        }
        setSelection(
          doc,
          normalizeSelection(
            cm,
            startSel.ranges.slice(0, ourIndex).concat(ranges),
            ourIndex
          ),
          { origin: "*mouse", scroll: false }
        );
        cm.scrollIntoView(pos);
      } else {
        var oldRange = ourRange;
        var range = rangeForUnit(cm, pos, behavior.unit);
        var anchor = oldRange.anchor,
          head;
        if (cmp(range.anchor, anchor) > 0) {
          head = range.head;
          anchor = minPos(oldRange.from(), range.anchor);
        } else {
          head = range.anchor;
          anchor = maxPos(oldRange.to(), range.head);
        }
        var ranges$1 = startSel.ranges.slice(0);
        ranges$1[ourIndex] = bidiSimplify(
          cm,
          new Range(clipPos(doc, anchor), head)
        );
        setSelection(
          doc,
          normalizeSelection(cm, ranges$1, ourIndex),
          sel_mouse
        );
      }
    }

    var editorSize = display.wrapper.getBoundingClientRect();
    // Used to ensure timeout re-tries don't fire when another extend
    // happened in the meantime (clearTimeout isn't reliable -- at
    // least on Chrome, the timeouts still happen even when cleared,
    // if the clear happens after their scheduled firing time).
    var counter = 0;

    function extend(e) {
      var curCount = ++counter;
      var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle");
      if (!cur) {
        return;
      }
      if (cmp(cur, lastPos) != 0) {
        cm.curOp.focus = activeElt();
        extendTo(cur);
        var visible = visibleLines(display, doc);
        if (cur.line >= visible.to || cur.line < visible.from) {
          setTimeout(
            operation(cm, function () {
              if (counter == curCount) {
                extend(e);
              }
            }),
            150
          );
        }
      } else {
        var outside =
          e.clientY < editorSize.top
            ? -20
            : e.clientY > editorSize.bottom
            ? 20
            : 0;
        if (outside) {
          setTimeout(
            operation(cm, function () {
              if (counter != curCount) {
                return;
              }
              display.scroller.scrollTop += outside;
              extend(e);
            }),
            50
          );
        }
      }
    }

    function done(e) {
      cm.state.selectingText = false;
      counter = Infinity;
      // If e is null or undefined we interpret this as someone trying
      // to explicitly cancel the selection rather than the user
      // letting go of the mouse button.
      if (e) {
        e_preventDefault(e);
        display.input.focus();
      }
      off(display.wrapper.ownerDocument, "mousemove", move);
      off(display.wrapper.ownerDocument, "mouseup", up);
      doc.history.lastSelOrigin = null;
    }

    var move = operation(cm, function (e) {
      if (e.buttons === 0 || !e_button(e)) {
        done(e);
      } else {
        extend(e);
      }
    });
    var up = operation(cm, done);
    cm.state.selectingText = up;
    on(display.wrapper.ownerDocument, "mousemove", move);
    on(display.wrapper.ownerDocument, "mouseup", up);
  }

  // Used when mouse-selecting to adjust the anchor to the proper side
  // of a bidi jump depending on the visual position of the head.
  function bidiSimplify(cm, range) {
    var anchor = range.anchor;
    var head = range.head;
    var anchorLine = getLine(cm.doc, anchor.line);
    if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) {
      return range;
    }
    var order = getOrder(anchorLine);
    if (!order) {
      return range;
    }
    var index = getBidiPartAt(order, anchor.ch, anchor.sticky),
      part = order[index];
    if (part.from != anchor.ch && part.to != anchor.ch) {
      return range;
    }
    var boundary =
      index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);
    if (boundary == 0 || boundary == order.length) {
      return range;
    }

    // Compute the relative visual position of the head compared to the
    // anchor (<0 is to the left, >0 to the right)
    var leftSide;
    if (head.line != anchor.line) {
      leftSide =
        (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0;
    } else {
      var headIndex = getBidiPartAt(order, head.ch, head.sticky);
      var dir =
        headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);
      if (headIndex == boundary - 1 || headIndex == boundary) {
        leftSide = dir < 0;
      } else {
        leftSide = dir > 0;
      }
    }

    var usePart = order[boundary + (leftSide ? -1 : 0)];
    var from = leftSide == (usePart.level == 1);
    var ch = from ? usePart.from : usePart.to,
      sticky = from ? "after" : "before";
    return anchor.ch == ch && anchor.sticky == sticky
      ? range
      : new Range(new Pos(anchor.line, ch, sticky), head);
  }

  // Determines whether an event happened in the gutter, and fires the
  // handlers for the corresponding event.
  function gutterEvent(cm, e, type, prevent) {
    var mX, mY;
    if (e.touches) {
      mX = e.touches[0].clientX;
      mY = e.touches[0].clientY;
    } else {
      try {
        mX = e.clientX;
        mY = e.clientY;
      } catch (e$1) {
        return false;
      }
    }
    if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) {
      return false;
    }
    if (prevent) {
      e_preventDefault(e);
    }

    var display = cm.display;
    var lineBox = display.lineDiv.getBoundingClientRect();

    if (mY > lineBox.bottom || !hasHandler(cm, type)) {
      return e_defaultPrevented(e);
    }
    mY -= lineBox.top - display.viewOffset;

    for (var i = 0; i < cm.display.gutterSpecs.length; ++i) {
      var g = display.gutters.childNodes[i];
      if (g && g.getBoundingClientRect().right >= mX) {
        var line = lineAtHeight(cm.doc, mY);
        var gutter = cm.display.gutterSpecs[i];
        signal(cm, type, cm, line, gutter.className, e);
        return e_defaultPrevented(e);
      }
    }
  }

  function clickInGutter(cm, e) {
    return gutterEvent(cm, e, "gutterClick", true);
  }

  // CONTEXT MENU HANDLING

  // To make the context menu work, we need to briefly unhide the
  // textarea (making it as unobtrusive as possible) to let the
  // right-click take effect on it.
  function onContextMenu(cm, e) {
    if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) {
      return;
    }
    if (signalDOMEvent(cm, e, "contextmenu")) {
      return;
    }
    if (!captureRightClick) {
      cm.display.input.onContextMenu(e);
    }
  }

  function contextMenuInGutter(cm, e) {
    if (!hasHandler(cm, "gutterContextMenu")) {
      return false;
    }
    return gutterEvent(cm, e, "gutterContextMenu", false);
  }

  function themeChanged(cm) {
    cm.display.wrapper.className =
      cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
      cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
    clearCaches(cm);
  }

  var Init = {
    toString: function () {
      return "CodeMirror.Init";
    },
  };

  var defaults = {};
  var optionHandlers = {};

  function defineOptions(CodeMirror) {
    var optionHandlers = CodeMirror.optionHandlers;

    function option(name, deflt, handle, notOnInit) {
      CodeMirror.defaults[name] = deflt;
      if (handle) {
        optionHandlers[name] = notOnInit
          ? function (cm, val, old) {
              if (old != Init) {
                handle(cm, val, old);
              }
            }
          : handle;
      }
    }

    CodeMirror.defineOption = option;

    // Passed to option handlers when there is no old value.
    CodeMirror.Init = Init;

    // These two are, on init, called from the constructor because they
    // have to be initialized before the editor can start at all.
    option(
      "value",
      "",
      function (cm, val) {
        return cm.setValue(val);
      },
      true
    );
    option(
      "mode",
      null,
      function (cm, val) {
        cm.doc.modeOption = val;
        loadMode(cm);
      },
      true
    );

    option("indentUnit", 2, loadMode, true);
    option("indentWithTabs", false);
    option("smartIndent", true);
    option(
      "tabSize",
      4,
      function (cm) {
        resetModeState(cm);
        clearCaches(cm);
        regChange(cm);
      },
      true
    );

    option("lineSeparator", null, function (cm, val) {
      cm.doc.lineSep = val;
      if (!val) {
        return;
      }
      var newBreaks = [],
        lineNo = cm.doc.first;
      cm.doc.iter(function (line) {
        for (var pos = 0; ; ) {
          var found = line.text.indexOf(val, pos);
          if (found == -1) {
            break;
          }
          pos = found + val.length;
          newBreaks.push(Pos(lineNo, found));
        }
        lineNo++;
      });
      for (var i = newBreaks.length - 1; i >= 0; i--) {
        replaceRange(
          cm.doc,
          val,
          newBreaks[i],
          Pos(newBreaks[i].line, newBreaks[i].ch + val.length)
        );
      }
    });
    option(
      "specialChars",
      /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b\u200e\u200f\u2028\u2029\ufeff\ufff9-\ufffc]/g,
      function (cm, val, old) {
        cm.state.specialChars = new RegExp(
          val.source + (val.test("\t") ? "" : "|\t"),
          "g"
        );
        if (old != Init) {
          cm.refresh();
        }
      }
    );
    option(
      "specialCharPlaceholder",
      defaultSpecialCharPlaceholder,
      function (cm) {
        return cm.refresh();
      },
      true
    );
    option("electricChars", true);
    option(
      "inputStyle",
      mobile ? "contenteditable" : "textarea",
      function () {
        throw new Error(
          "inputStyle can not (yet) be changed in a running editor"
        ); // FIXME
      },
      true
    );
    option(
      "spellcheck",
      false,
      function (cm, val) {
        return (cm.getInputField().spellcheck = val);
      },
      true
    );
    option(
      "autocorrect",
      false,
      function (cm, val) {
        return (cm.getInputField().autocorrect = val);
      },
      true
    );
    option(
      "autocapitalize",
      false,
      function (cm, val) {
        return (cm.getInputField().autocapitalize = val);
      },
      true
    );
    option("rtlMoveVisually", !windows);
    option("wholeLineUpdateBefore", true);

    option(
      "theme",
      "default",
      function (cm) {
        themeChanged(cm);
        updateGutters(cm);
      },
      true
    );
    option("keyMap", "default", function (cm, val, old) {
      var next = getKeyMap(val);
      var prev = old != Init && getKeyMap(old);
      if (prev && prev.detach) {
        prev.detach(cm, next);
      }
      if (next.attach) {
        next.attach(cm, prev || null);
      }
    });
    option("extraKeys", null);
    option("configureMouse", null);

    option("lineWrapping", false, wrappingChanged, true);
    option(
      "gutters",
      [],
      function (cm, val) {
        cm.display.gutterSpecs = getGutters(val, cm.options.lineNumbers);
        updateGutters(cm);
      },
      true
    );
    option(
      "fixedGutter",
      true,
      function (cm, val) {
        cm.display.gutters.style.left = val
          ? compensateForHScroll(cm.display) + "px"
          : "0";
        cm.refresh();
      },
      true
    );
    option(
      "coverGutterNextToScrollbar",
      false,
      function (cm) {
        return updateScrollbars(cm);
      },
      true
    );
    option(
      "scrollbarStyle",
      "native",
      function (cm) {
        initScrollbars(cm);
        updateScrollbars(cm);
        cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
        cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
      },
      true
    );
    option(
      "lineNumbers",
      false,
      function (cm, val) {
        cm.display.gutterSpecs = getGutters(cm.options.gutters, val);
        updateGutters(cm);
      },
      true
    );
    option("firstLineNumber", 1, updateGutters, true);
    option(
      "lineNumberFormatter",
      function (integer) {
        return integer;
      },
      updateGutters,
      true
    );
    option("showCursorWhenSelecting", false, updateSelection, true);

    option("resetSelectionOnContextMenu", true);
    option("lineWiseCopyCut", true);
    option("pasteLinesPerSelection", true);
    option("selectionsMayTouch", false);

    option("readOnly", false, function (cm, val) {
      if (val == "nocursor") {
        onBlur(cm);
        cm.display.input.blur();
      }
      cm.display.input.readOnlyChanged(val);
    });

    option("screenReaderLabel", null, function (cm, val) {
      val = val === "" ? null : val;
      cm.display.input.screenReaderLabelChanged(val);
    });

    option(
      "disableInput",
      false,
      function (cm, val) {
        if (!val) {
          cm.display.input.reset();
        }
      },
      true
    );
    option("dragDrop", true, dragDropChanged);
    option("allowDropFileTypes", null);

    option("cursorBlinkRate", 530);
    option("cursorScrollMargin", 0);
    option("cursorHeight", 1, updateSelection, true);
    option("singleCursorHeightPerLine", true, updateSelection, true);
    option("workTime", 100);
    option("workDelay", 100);
    option("flattenSpans", true, resetModeState, true);
    option("addModeClass", false, resetModeState, true);
    option("pollInterval", 100);
    option("undoDepth", 200, function (cm, val) {
      return (cm.doc.history.undoDepth = val);
    });
    option("historyEventDelay", 1250);
    option(
      "viewportMargin",
      10,
      function (cm) {
        return cm.refresh();
      },
      true
    );
    option("maxHighlightLength", 10000, resetModeState, true);
    option("moveInputWithCursor", true, function (cm, val) {
      if (!val) {
        cm.display.input.resetPosition();
      }
    });

    option("tabindex", null, function (cm, val) {
      return (cm.display.input.getField().tabIndex = val || "");
    });
    option("autofocus", null);
    option(
      "direction",
      "ltr",
      function (cm, val) {
        return cm.doc.setDirection(val);
      },
      true
    );
    option("phrases", null);
  }

  function dragDropChanged(cm, value, old) {
    var wasOn = old && old != Init;
    if (!value != !wasOn) {
      var funcs = cm.display.dragFunctions;
      var toggle = value ? on : off;
      toggle(cm.display.scroller, "dragstart", funcs.start);
      toggle(cm.display.scroller, "dragenter", funcs.enter);
      toggle(cm.display.scroller, "dragover", funcs.over);
      toggle(cm.display.scroller, "dragleave", funcs.leave);
      toggle(cm.display.scroller, "drop", funcs.drop);
    }
  }

  function wrappingChanged(cm) {
    if (cm.options.lineWrapping) {
      addClass(cm.display.wrapper, "CodeMirror-wrap");
      cm.display.sizer.style.minWidth = "";
      cm.display.sizerWidth = null;
    } else {
      rmClass(cm.display.wrapper, "CodeMirror-wrap");
      findMaxLine(cm);
    }
    estimateLineHeights(cm);
    regChange(cm);
    clearCaches(cm);
    setTimeout(function () {
      return updateScrollbars(cm);
    }, 100);
  }

  // A CodeMirror instance represents an editor. This is the object
  // that user code is usually dealing with.

  function CodeMirror(place, options) {
    var this$1 = this;

    if (!(this instanceof CodeMirror)) {
      return new CodeMirror(place, options);
    }

    this.options = options = options ? copyObj(options) : {};
    // Determine effective options based on given values and defaults.
    copyObj(defaults, options, false);

    var doc = options.value;
    if (typeof doc == "string") {
      doc = new Doc(
        doc,
        options.mode,
        null,
        options.lineSeparator,
        options.direction
      );
    } else if (options.mode) {
      doc.modeOption = options.mode;
    }
    this.doc = doc;

    var input = new CodeMirror.inputStyles[options.inputStyle](this);
    var display = (this.display = new Display(place, doc, input, options));
    display.wrapper.CodeMirror = this;
    themeChanged(this);
    if (options.lineWrapping) {
      this.display.wrapper.className += " CodeMirror-wrap";
    }
    initScrollbars(this);

    this.state = {
      keyMaps: [], // stores maps added by addKeyMap
      overlays: [], // highlighting overlays, as added by addOverlay
      modeGen: 0, // bumped when mode/overlay changes, used to invalidate highlighting info
      overwrite: false,
      delayingBlurEvent: false,
      focused: false,
      suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
      pasteIncoming: -1,
      cutIncoming: -1, // help recognize paste/cut edits in input.poll
      selectingText: false,
      draggingText: false,
      highlight: new Delayed(), // stores highlight worker timeout
      keySeq: null, // Unfinished key sequence
      specialChars: null,
    };

    if (options.autofocus && !mobile) {
      display.input.focus();
    }

    // Override magic textarea content restore that IE sometimes does
    // on our hidden textarea on reload
    if (ie && ie_version < 11) {
      setTimeout(function () {
        return this$1.display.input.reset(true);
      }, 20);
    }

    registerEventHandlers(this);
    ensureGlobalHandlers();

    startOperation(this);
    this.curOp.forceUpdate = true;
    attachDoc(this, doc);

    if ((options.autofocus && !mobile) || this.hasFocus()) {
      setTimeout(function () {
        if (this$1.hasFocus() && !this$1.state.focused) {
          onFocus(this$1);
        }
      }, 20);
    } else {
      onBlur(this);
    }

    for (var opt in optionHandlers) {
      if (optionHandlers.hasOwnProperty(opt)) {
        optionHandlers[opt](this, options[opt], Init);
      }
    }
    maybeUpdateLineNumberWidth(this);
    if (options.finishInit) {
      options.finishInit(this);
    }
    for (var i = 0; i < initHooks.length; ++i) {
      initHooks[i](this);
    }
    endOperation(this);
    // Suppress optimizelegibility in Webkit, since it breaks text
    // measuring on line wrapping boundaries.
    if (
      webkit &&
      options.lineWrapping &&
      getComputedStyle(display.lineDiv).textRendering == "optimizelegibility"
    ) {
      display.lineDiv.style.textRendering = "auto";
    }
  }

  // The default configuration options.
  CodeMirror.defaults = defaults;
  // Functions to run when options are changed.
  CodeMirror.optionHandlers = optionHandlers;

  // Attach the necessary event handlers when initializing the editor
  function registerEventHandlers(cm) {
    var d = cm.display;
    on(d.scroller, "mousedown", operation(cm, onMouseDown));
    // Older IE's will not fire a second mousedown for a double click
    if (ie && ie_version < 11) {
      on(
        d.scroller,
        "dblclick",
        operation(cm, function (e) {
          if (signalDOMEvent(cm, e)) {
            return;
          }
          var pos = posFromMouse(cm, e);
          if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) {
            return;
          }
          e_preventDefault(e);
          var word = cm.findWordAt(pos);
          extendSelection(cm.doc, word.anchor, word.head);
        })
      );
    } else {
      on(d.scroller, "dblclick", function (e) {
        return signalDOMEvent(cm, e) || e_preventDefault(e);
      });
    }
    // Some browsers fire contextmenu *after* opening the menu, at
    // which point we can't mess with it anymore. Context menu is
    // handled in onMouseDown for these browsers.
    on(d.scroller, "contextmenu", function (e) {
      return onContextMenu(cm, e);
    });
    on(d.input.getField(), "contextmenu", function (e) {
      if (!d.scroller.contains(e.target)) {
        onContextMenu(cm, e);
      }
    });

    // Used to suppress mouse event handling when a touch happens
    var touchFinished,
      prevTouch = { end: 0 };
    function finishTouch() {
      if (d.activeTouch) {
        touchFinished = setTimeout(function () {
          return (d.activeTouch = null);
        }, 1000);
        prevTouch = d.activeTouch;
        prevTouch.end = +new Date();
      }
    }
    function isMouseLikeTouchEvent(e) {
      if (e.touches.length != 1) {
        return false;
      }
      var touch = e.touches[0];
      return touch.radiusX <= 1 && touch.radiusY <= 1;
    }
    function farAway(touch, other) {
      if (other.left == null) {
        return true;
      }
      var dx = other.left - touch.left,
        dy = other.top - touch.top;
      return dx * dx + dy * dy > 20 * 20;
    }
    on(d.scroller, "touchstart", function (e) {
      if (
        !signalDOMEvent(cm, e) &&
        !isMouseLikeTouchEvent(e) &&
        !clickInGutter(cm, e)
      ) {
        d.input.ensurePolled();
        clearTimeout(touchFinished);
        var now = +new Date();
        d.activeTouch = {
          start: now,
          moved: false,
          prev: now - prevTouch.end <= 300 ? prevTouch : null,
        };
        if (e.touches.length == 1) {
          d.activeTouch.left = e.touches[0].pageX;
          d.activeTouch.top = e.touches[0].pageY;
        }
      }
    });
    on(d.scroller, "touchmove", function () {
      if (d.activeTouch) {
        d.activeTouch.moved = true;
      }
    });
    on(d.scroller, "touchend", function (e) {
      var touch = d.activeTouch;
      if (
        touch &&
        !eventInWidget(d, e) &&
        touch.left != null &&
        !touch.moved &&
        new Date() - touch.start < 300
      ) {
        var pos = cm.coordsChar(d.activeTouch, "page"),
          range;
        if (!touch.prev || farAway(touch, touch.prev)) {
          // Single tap
          range = new Range(pos, pos);
        } else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) {
          // Double tap
          range = cm.findWordAt(pos);
        } // Triple tap
        else {
          range = new Range(
            Pos(pos.line, 0),
            clipPos(cm.doc, Pos(pos.line + 1, 0))
          );
        }
        cm.setSelection(range.anchor, range.head);
        cm.focus();
        e_preventDefault(e);
      }
      finishTouch();
    });
    on(d.scroller, "touchcancel", finishTouch);

    // Sync scrolling between fake scrollbars and real scrollable
    // area, ensure viewport is updated when scrolling.
    on(d.scroller, "scroll", function () {
      if (d.scroller.clientHeight) {
        updateScrollTop(cm, d.scroller.scrollTop);
        setScrollLeft(cm, d.scroller.scrollLeft, true);
        signal(cm, "scroll", cm);
      }
    });

    // Listen to wheel events in order to try and update the viewport on time.
    on(d.scroller, "mousewheel", function (e) {
      return onScrollWheel(cm, e);
    });
    on(d.scroller, "DOMMouseScroll", function (e) {
      return onScrollWheel(cm, e);
    });

    // Prevent wrapper from ever scrolling
    on(d.wrapper, "scroll", function () {
      return (d.wrapper.scrollTop = d.wrapper.scrollLeft = 0);
    });

    d.dragFunctions = {
      enter: function (e) {
        if (!signalDOMEvent(cm, e)) {
          e_stop(e);
        }
      },
      over: function (e) {
        if (!signalDOMEvent(cm, e)) {
          onDragOver(cm, e);
          e_stop(e);
        }
      },
      start: function (e) {
        return onDragStart(cm, e);
      },
      drop: operation(cm, onDrop),
      leave: function (e) {
        if (!signalDOMEvent(cm, e)) {
          clearDragCursor(cm);
        }
      },
    };

    var inp = d.input.getField();
    on(inp, "keyup", function (e) {
      return onKeyUp.call(cm, e);
    });
    on(inp, "keydown", operation(cm, onKeyDown));
    on(inp, "keypress", operation(cm, onKeyPress));
    on(inp, "focus", function (e) {
      return onFocus(cm, e);
    });
    on(inp, "blur", function (e) {
      return onBlur(cm, e);
    });
  }

  var initHooks = [];
  CodeMirror.defineInitHook = function (f) {
    return initHooks.push(f);
  };

  // Indent the given line. The how parameter can be "smart",
  // "add"/null, "subtract", or "prev". When aggressive is false
  // (typically set to true for forced single-line indents), empty
  // lines are not indented, and places where the mode returns Pass
  // are left alone.
  function indentLine(cm, n, how, aggressive) {
    var doc = cm.doc,
      state;
    if (how == null) {
      how = "add";
    }
    if (how == "smart") {
      // Fall back to "prev" when the mode doesn't have an indentation
      // method.
      if (!doc.mode.indent) {
        how = "prev";
      } else {
        state = getContextBefore(cm, n).state;
      }
    }

    var tabSize = cm.options.tabSize;
    var line = getLine(doc, n),
      curSpace = countColumn(line.text, null, tabSize);
    if (line.stateAfter) {
      line.stateAfter = null;
    }
    var curSpaceString = line.text.match(/^\s*/)[0],
      indentation;
    if (!aggressive && !/\S/.test(line.text)) {
      indentation = 0;
      how = "not";
    } else if (how == "smart") {
      indentation = doc.mode.indent(
        state,
        line.text.slice(curSpaceString.length),
        line.text
      );
      if (indentation == Pass || indentation > 150) {
        if (!aggressive) {
          return;
        }
        how = "prev";
      }
    }
    if (how == "prev") {
      if (n > doc.first) {
        indentation = countColumn(getLine(doc, n - 1).text, null, tabSize);
      } else {
        indentation = 0;
      }
    } else if (how == "add") {
      indentation = curSpace + cm.options.indentUnit;
    } else if (how == "subtract") {
      indentation = curSpace - cm.options.indentUnit;
    } else if (typeof how == "number") {
      indentation = curSpace + how;
    }
    indentation = Math.max(0, indentation);

    var indentString = "",
      pos = 0;
    if (cm.options.indentWithTabs) {
      for (var i = Math.floor(indentation / tabSize); i; --i) {
        pos += tabSize;
        indentString += "\t";
      }
    }
    if (pos < indentation) {
      indentString += spaceStr(indentation - pos);
    }

    if (indentString != curSpaceString) {
      replaceRange(
        doc,
        indentString,
        Pos(n, 0),
        Pos(n, curSpaceString.length),
        "+input"
      );
      line.stateAfter = null;
      return true;
    } else {
      // Ensure that, if the cursor was in the whitespace at the start
      // of the line, it is moved to the end of that space.
      for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
        var range = doc.sel.ranges[i$1];
        if (range.head.line == n && range.head.ch < curSpaceString.length) {
          var pos$1 = Pos(n, curSpaceString.length);
          replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));
          break;
        }
      }
    }
  }

  // This will be set to a {lineWise: bool, text: [string]} object, so
  // that, when pasting, we know what kind of selections the copied
  // text was made out of.
  var lastCopied = null;

  function setLastCopied(newLastCopied) {
    lastCopied = newLastCopied;
  }

  function applyTextInput(cm, inserted, deleted, sel, origin) {
    var doc = cm.doc;
    cm.display.shift = false;
    if (!sel) {
      sel = doc.sel;
    }

    var recent = +new Date() - 200;
    var paste = origin == "paste" || cm.state.pasteIncoming > recent;
    var textLines = splitLinesAuto(inserted),
      multiPaste = null;
    // When pasting N lines into N selections, insert one line per selection
    if (paste && sel.ranges.length > 1) {
      if (lastCopied && lastCopied.text.join("\n") == inserted) {
        if (sel.ranges.length % lastCopied.text.length == 0) {
          multiPaste = [];
          for (var i = 0; i < lastCopied.text.length; i++) {
            multiPaste.push(doc.splitLines(lastCopied.text[i]));
          }
        }
      } else if (
        textLines.length == sel.ranges.length &&
        cm.options.pasteLinesPerSelection
      ) {
        multiPaste = map(textLines, function (l) {
          return [l];
        });
      }
    }

    var updateInput = cm.curOp.updateInput;
    // Normal behavior is to insert the new text into every selection
    for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
      var range = sel.ranges[i$1];
      var from = range.from(),
        to = range.to();
      if (range.empty()) {
        if (deleted && deleted > 0) {
          // Handle deletion
          from = Pos(from.line, from.ch - deleted);
        } else if (cm.state.overwrite && !paste) {
          // Handle overwrite
          to = Pos(
            to.line,
            Math.min(
              getLine(doc, to.line).text.length,
              to.ch + lst(textLines).length
            )
          );
        } else if (
          paste &&
          lastCopied &&
          lastCopied.lineWise &&
          lastCopied.text.join("\n") == textLines.join("\n")
        ) {
          from = to = Pos(from.line, 0);
        }
      }
      var changeEvent = {
        from: from,
        to: to,
        text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
        origin:
          origin ||
          (paste ? "paste" : cm.state.cutIncoming > recent ? "cut" : "+input"),
      };
      makeChange(cm.doc, changeEvent);
      signalLater(cm, "inputRead", cm, changeEvent);
    }
    if (inserted && !paste) {
      triggerElectric(cm, inserted);
    }

    ensureCursorVisible(cm);
    if (cm.curOp.updateInput < 2) {
      cm.curOp.updateInput = updateInput;
    }
    cm.curOp.typing = true;
    cm.state.pasteIncoming = cm.state.cutIncoming = -1;
  }

  function handlePaste(e, cm) {
    var pasted = e.clipboardData && e.clipboardData.getData("Text");
    if (pasted) {
      e.preventDefault();
      if (!cm.isReadOnly() && !cm.options.disableInput) {
        runInOp(cm, function () {
          return applyTextInput(cm, pasted, 0, null, "paste");
        });
      }
      return true;
    }
  }

  function triggerElectric(cm, inserted) {
    // When an 'electric' character is inserted, immediately trigger a reindent
    if (!cm.options.electricChars || !cm.options.smartIndent) {
      return;
    }
    var sel = cm.doc.sel;

    for (var i = sel.ranges.length - 1; i >= 0; i--) {
      var range = sel.ranges[i];
      if (
        range.head.ch > 100 ||
        (i && sel.ranges[i - 1].head.line == range.head.line)
      ) {
        continue;
      }
      var mode = cm.getModeAt(range.head);
      var indented = false;
      if (mode.electricChars) {
        for (var j = 0; j < mode.electricChars.length; j++) {
          if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
            indented = indentLine(cm, range.head.line, "smart");
            break;
          }
        }
      } else if (mode.electricInput) {
        if (
          mode.electricInput.test(
            getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)
          )
        ) {
          indented = indentLine(cm, range.head.line, "smart");
        }
      }
      if (indented) {
        signalLater(cm, "electricInput", cm, range.head.line);
      }
    }
  }

  function copyableRanges(cm) {
    var text = [],
      ranges = [];
    for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
      var line = cm.doc.sel.ranges[i].head.line;
      var lineRange = { anchor: Pos(line, 0), head: Pos(line + 1, 0) };
      ranges.push(lineRange);
      text.push(cm.getRange(lineRange.anchor, lineRange.head));
    }
    return { text: text, ranges: ranges };
  }

  function disableBrowserMagic(field, spellcheck, autocorrect, autocapitalize) {
    field.setAttribute("autocorrect", autocorrect ? "" : "off");
    field.setAttribute("autocapitalize", autocapitalize ? "" : "off");
    field.setAttribute("spellcheck", !!spellcheck);
  }

  function hiddenTextarea() {
    var te = elt(
      "textarea",
      null,
      null,
      "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none"
    );
    var div = elt(
      "div",
      [te],
      null,
      "overflow: hidden; position: relative; width: 3px; height: 0px;"
    );
    // The textarea is kept positioned near the cursor to prevent the
    // fact that it'll be scrolled into view on input from scrolling
    // our fake cursor out of view. On webkit, when wrap=off, paste is
    // very slow. So make the area wide instead.
    if (webkit) {
      te.style.width = "1000px";
    } else {
      te.setAttribute("wrap", "off");
    }
    // If border: 0; -- iOS fails to open keyboard (issue #1287)
    if (ios) {
      te.style.border = "1px solid black";
    }
    disableBrowserMagic(te);
    return div;
  }

  // The publicly visible API. Note that methodOp(f) means
  // 'wrap f in an operation, performed on its `this` parameter'.

  // This is not the complete set of editor methods. Most of the
  // methods defined on the Doc type are also injected into
  // CodeMirror.prototype, for backwards compatibility and
  // convenience.

  function addEditorMethods(CodeMirror) {
    var optionHandlers = CodeMirror.optionHandlers;

    var helpers = (CodeMirror.helpers = {});

    CodeMirror.prototype = {
      constructor: CodeMirror,
      focus: function () {
        window.focus();
        this.display.input.focus();
      },

      setOption: function (option, value) {
        var options = this.options,
          old = options[option];
        if (options[option] == value && option != "mode") {
          return;
        }
        options[option] = value;
        if (optionHandlers.hasOwnProperty(option)) {
          operation(this, optionHandlers[option])(this, value, old);
        }
        signal(this, "optionChange", this, option);
      },

      getOption: function (option) {
        return this.options[option];
      },
      getDoc: function () {
        return this.doc;
      },

      addKeyMap: function (map, bottom) {
        this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map));
      },
      removeKeyMap: function (map) {
        var maps = this.state.keyMaps;
        for (var i = 0; i < maps.length; ++i) {
          if (maps[i] == map || maps[i].name == map) {
            maps.splice(i, 1);
            return true;
          }
        }
      },

      addOverlay: methodOp(function (spec, options) {
        var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
        if (mode.startState) {
          throw new Error("Overlays may not be stateful.");
        }
        insertSorted(
          this.state.overlays,
          {
            mode: mode,
            modeSpec: spec,
            opaque: options && options.opaque,
            priority: (options && options.priority) || 0,
          },
          function (overlay) {
            return overlay.priority;
          }
        );
        this.state.modeGen++;
        regChange(this);
      }),
      removeOverlay: methodOp(function (spec) {
        var overlays = this.state.overlays;
        for (var i = 0; i < overlays.length; ++i) {
          var cur = overlays[i].modeSpec;
          if (cur == spec || (typeof spec == "string" && cur.name == spec)) {
            overlays.splice(i, 1);
            this.state.modeGen++;
            regChange(this);
            return;
          }
        }
      }),

      indentLine: methodOp(function (n, dir, aggressive) {
        if (typeof dir != "string" && typeof dir != "number") {
          if (dir == null) {
            dir = this.options.smartIndent ? "smart" : "prev";
          } else {
            dir = dir ? "add" : "subtract";
          }
        }
        if (isLine(this.doc, n)) {
          indentLine(this, n, dir, aggressive);
        }
      }),
      indentSelection: methodOp(function (how) {
        var ranges = this.doc.sel.ranges,
          end = -1;
        for (var i = 0; i < ranges.length; i++) {
          var range = ranges[i];
          if (!range.empty()) {
            var from = range.from(),
              to = range.to();
            var start = Math.max(end, from.line);
            end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
            for (var j = start; j < end; ++j) {
              indentLine(this, j, how);
            }
            var newRanges = this.doc.sel.ranges;
            if (
              from.ch == 0 &&
              ranges.length == newRanges.length &&
              newRanges[i].from().ch > 0
            ) {
              replaceOneSelection(
                this.doc,
                i,
                new Range(from, newRanges[i].to()),
                sel_dontScroll
              );
            }
          } else if (range.head.line > end) {
            indentLine(this, range.head.line, how, true);
            end = range.head.line;
            if (i == this.doc.sel.primIndex) {
              ensureCursorVisible(this);
            }
          }
        }
      }),

      // Fetch the parser token for a given character. Useful for hacks
      // that want to inspect the mode state (say, for completion).
      getTokenAt: function (pos, precise) {
        return takeToken(this, pos, precise);
      },

      getLineTokens: function (line, precise) {
        return takeToken(this, Pos(line), precise, true);
      },

      getTokenTypeAt: function (pos) {
        pos = clipPos(this.doc, pos);
        var styles = getLineStyles(this, getLine(this.doc, pos.line));
        var before = 0,
          after = (styles.length - 1) / 2,
          ch = pos.ch;
        var type;
        if (ch == 0) {
          type = styles[2];
        } else {
          for (;;) {
            var mid = (before + after) >> 1;
            if ((mid ? styles[mid * 2 - 1] : 0) >= ch) {
              after = mid;
            } else if (styles[mid * 2 + 1] < ch) {
              before = mid + 1;
            } else {
              type = styles[mid * 2 + 2];
              break;
            }
          }
        }
        var cut = type ? type.indexOf("overlay ") : -1;
        return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1);
      },

      getModeAt: function (pos) {
        var mode = this.doc.mode;
        if (!mode.innerMode) {
          return mode;
        }
        return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode;
      },

      getHelper: function (pos, type) {
        return this.getHelpers(pos, type)[0];
      },

      getHelpers: function (pos, type) {
        var found = [];
        if (!helpers.hasOwnProperty(type)) {
          return found;
        }
        var help = helpers[type],
          mode = this.getModeAt(pos);
        if (typeof mode[type] == "string") {
          if (help[mode[type]]) {
            found.push(help[mode[type]]);
          }
        } else if (mode[type]) {
          for (var i = 0; i < mode[type].length; i++) {
            var val = help[mode[type][i]];
            if (val) {
              found.push(val);
            }
          }
        } else if (mode.helperType && help[mode.helperType]) {
          found.push(help[mode.helperType]);
        } else if (help[mode.name]) {
          found.push(help[mode.name]);
        }
        for (var i$1 = 0; i$1 < help._global.length; i$1++) {
          var cur = help._global[i$1];
          if (cur.pred(mode, this) && indexOf(found, cur.val) == -1) {
            found.push(cur.val);
          }
        }
        return found;
      },

      getStateAfter: function (line, precise) {
        var doc = this.doc;
        line = clipLine(doc, line == null ? doc.first + doc.size - 1 : line);
        return getContextBefore(this, line + 1, precise).state;
      },

      cursorCoords: function (start, mode) {
        var pos,
          range = this.doc.sel.primary();
        if (start == null) {
          pos = range.head;
        } else if (typeof start == "object") {
          pos = clipPos(this.doc, start);
        } else {
          pos = start ? range.from() : range.to();
        }
        return cursorCoords(this, pos, mode || "page");
      },

      charCoords: function (pos, mode) {
        return charCoords(this, clipPos(this.doc, pos), mode || "page");
      },

      coordsChar: function (coords, mode) {
        coords = fromCoordSystem(this, coords, mode || "page");
        return coordsChar(this, coords.left, coords.top);
      },

      lineAtHeight: function (height, mode) {
        height = fromCoordSystem(
          this,
          { top: height, left: 0 },
          mode || "page"
        ).top;
        return lineAtHeight(this.doc, height + this.display.viewOffset);
      },
      heightAtLine: function (line, mode, includeWidgets) {
        var end = false,
          lineObj;
        if (typeof line == "number") {
          var last = this.doc.first + this.doc.size - 1;
          if (line < this.doc.first) {
            line = this.doc.first;
          } else if (line > last) {
            line = last;
            end = true;
          }
          lineObj = getLine(this.doc, line);
        } else {
          lineObj = line;
        }
        return (
          intoCoordSystem(
            this,
            lineObj,
            { top: 0, left: 0 },
            mode || "page",
            includeWidgets || end
          ).top + (end ? this.doc.height - heightAtLine(lineObj) : 0)
        );
      },

      defaultTextHeight: function () {
        return textHeight(this.display);
      },
      defaultCharWidth: function () {
        return charWidth(this.display);
      },

      getViewport: function () {
        return { from: this.display.viewFrom, to: this.display.viewTo };
      },

      addWidget: function (pos, node, scroll, vert, horiz) {
        var display = this.display;
        pos = cursorCoords(this, clipPos(this.doc, pos));
        var top = pos.bottom,
          left = pos.left;
        node.style.position = "absolute";
        node.setAttribute("cm-ignore-events", "true");
        this.display.input.setUneditable(node);
        display.sizer.appendChild(node);
        if (vert == "over") {
          top = pos.top;
        } else if (vert == "above" || vert == "near") {
          var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
            hspace = Math.max(
              display.sizer.clientWidth,
              display.lineSpace.clientWidth
            );
          // Default to positioning above (if specified and possible); otherwise default to positioning below
          if (
            (vert == "above" || pos.bottom + node.offsetHeight > vspace) &&
            pos.top > node.offsetHeight
          ) {
            top = pos.top - node.offsetHeight;
          } else if (pos.bottom + node.offsetHeight <= vspace) {
            top = pos.bottom;
          }
          if (left + node.offsetWidth > hspace) {
            left = hspace - node.offsetWidth;
          }
        }
        node.style.top = top + "px";
        node.style.left = node.style.right = "";
        if (horiz == "right") {
          left = display.sizer.clientWidth - node.offsetWidth;
          node.style.right = "0px";
        } else {
          if (horiz == "left") {
            left = 0;
          } else if (horiz == "middle") {
            left = (display.sizer.clientWidth - node.offsetWidth) / 2;
          }
          node.style.left = left + "px";
        }
        if (scroll) {
          scrollIntoView(this, {
            left: left,
            top: top,
            right: left + node.offsetWidth,
            bottom: top + node.offsetHeight,
          });
        }
      },

      triggerOnKeyDown: methodOp(onKeyDown),
      triggerOnKeyPress: methodOp(onKeyPress),
      triggerOnKeyUp: onKeyUp,
      triggerOnMouseDown: methodOp(onMouseDown),

      execCommand: function (cmd) {
        if (commands.hasOwnProperty(cmd)) {
          return commands[cmd].call(null, this);
        }
      },

      triggerElectric: methodOp(function (text) {
        triggerElectric(this, text);
      }),

      findPosH: function (from, amount, unit, visually) {
        var dir = 1;
        if (amount < 0) {
          dir = -1;
          amount = -amount;
        }
        var cur = clipPos(this.doc, from);
        for (var i = 0; i < amount; ++i) {
          cur = findPosH(this.doc, cur, dir, unit, visually);
          if (cur.hitSide) {
            break;
          }
        }
        return cur;
      },

      moveH: methodOp(function (dir, unit) {
        var this$1 = this;

        this.extendSelectionsBy(function (range) {
          if (this$1.display.shift || this$1.doc.extend || range.empty()) {
            return findPosH(
              this$1.doc,
              range.head,
              dir,
              unit,
              this$1.options.rtlMoveVisually
            );
          } else {
            return dir < 0 ? range.from() : range.to();
          }
        }, sel_move);
      }),

      deleteH: methodOp(function (dir, unit) {
        var sel = this.doc.sel,
          doc = this.doc;
        if (sel.somethingSelected()) {
          doc.replaceSelection("", null, "+delete");
        } else {
          deleteNearSelection(this, function (range) {
            var other = findPosH(doc, range.head, dir, unit, false);
            return dir < 0
              ? { from: other, to: range.head }
              : { from: range.head, to: other };
          });
        }
      }),

      findPosV: function (from, amount, unit, goalColumn) {
        var dir = 1,
          x = goalColumn;
        if (amount < 0) {
          dir = -1;
          amount = -amount;
        }
        var cur = clipPos(this.doc, from);
        for (var i = 0; i < amount; ++i) {
          var coords = cursorCoords(this, cur, "div");
          if (x == null) {
            x = coords.left;
          } else {
            coords.left = x;
          }
          cur = findPosV(this, coords, dir, unit);
          if (cur.hitSide) {
            break;
          }
        }
        return cur;
      },

      moveV: methodOp(function (dir, unit) {
        var this$1 = this;

        var doc = this.doc,
          goals = [];
        var collapse =
          !this.display.shift && !doc.extend && doc.sel.somethingSelected();
        doc.extendSelectionsBy(function (range) {
          if (collapse) {
            return dir < 0 ? range.from() : range.to();
          }
          var headPos = cursorCoords(this$1, range.head, "div");
          if (range.goalColumn != null) {
            headPos.left = range.goalColumn;
          }
          goals.push(headPos.left);
          var pos = findPosV(this$1, headPos, dir, unit);
          if (unit == "page" && range == doc.sel.primary()) {
            addToScrollTop(
              this$1,
              charCoords(this$1, pos, "div").top - headPos.top
            );
          }
          return pos;
        }, sel_move);
        if (goals.length) {
          for (var i = 0; i < doc.sel.ranges.length; i++) {
            doc.sel.ranges[i].goalColumn = goals[i];
          }
        }
      }),

      // Find the word at the given position (as returned by coordsChar).
      findWordAt: function (pos) {
        var doc = this.doc,
          line = getLine(doc, pos.line).text;
        var start = pos.ch,
          end = pos.ch;
        if (line) {
          var helper = this.getHelper(pos, "wordChars");
          if ((pos.sticky == "before" || end == line.length) && start) {
            --start;
          } else {
            ++end;
          }
          var startChar = line.charAt(start);
          var check = isWordChar(startChar, helper)
            ? function (ch) {
                return isWordChar(ch, helper);
              }
            : /\s/.test(startChar)
            ? function (ch) {
                return /\s/.test(ch);
              }
            : function (ch) {
                return !/\s/.test(ch) && !isWordChar(ch);
              };
          while (start > 0 && check(line.charAt(start - 1))) {
            --start;
          }
          while (end < line.length && check(line.charAt(end))) {
            ++end;
          }
        }
        return new Range(Pos(pos.line, start), Pos(pos.line, end));
      },

      toggleOverwrite: function (value) {
        if (value != null && value == this.state.overwrite) {
          return;
        }
        if ((this.state.overwrite = !this.state.overwrite)) {
          addClass(this.display.cursorDiv, "CodeMirror-overwrite");
        } else {
          rmClass(this.display.cursorDiv, "CodeMirror-overwrite");
        }

        signal(this, "overwriteToggle", this, this.state.overwrite);
      },
      hasFocus: function () {
        return this.display.input.getField() == activeElt();
      },
      isReadOnly: function () {
        return !!(this.options.readOnly || this.doc.cantEdit);
      },

      scrollTo: methodOp(function (x, y) {
        scrollToCoords(this, x, y);
      }),
      getScrollInfo: function () {
        var scroller = this.display.scroller;
        return {
          left: scroller.scrollLeft,
          top: scroller.scrollTop,
          height:
            scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
          width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
          clientHeight: displayHeight(this),
          clientWidth: displayWidth(this),
        };
      },

      scrollIntoView: methodOp(function (range, margin) {
        if (range == null) {
          range = { from: this.doc.sel.primary().head, to: null };
          if (margin == null) {
            margin = this.options.cursorScrollMargin;
          }
        } else if (typeof range == "number") {
          range = { from: Pos(range, 0), to: null };
        } else if (range.from == null) {
          range = { from: range, to: null };
        }
        if (!range.to) {
          range.to = range.from;
        }
        range.margin = margin || 0;

        if (range.from.line != null) {
          scrollToRange(this, range);
        } else {
          scrollToCoordsRange(this, range.from, range.to, range.margin);
        }
      }),

      setSize: methodOp(function (width, height) {
        var this$1 = this;

        var interpret = function (val) {
          return typeof val == "number" || /^\d+$/.test(String(val))
            ? val + "px"
            : val;
        };
        if (width != null) {
          this.display.wrapper.style.width = interpret(width);
        }
        if (height != null) {
          this.display.wrapper.style.height = interpret(height);
        }
        if (this.options.lineWrapping) {
          clearLineMeasurementCache(this);
        }
        var lineNo = this.display.viewFrom;
        this.doc.iter(lineNo, this.display.viewTo, function (line) {
          if (line.widgets) {
            for (var i = 0; i < line.widgets.length; i++) {
              if (line.widgets[i].noHScroll) {
                regLineChange(this$1, lineNo, "widget");
                break;
              }
            }
          }
          ++lineNo;
        });
        this.curOp.forceUpdate = true;
        signal(this, "refresh", this);
      }),

      operation: function (f) {
        return runInOp(this, f);
      },
      startOperation: function () {
        return startOperation(this);
      },
      endOperation: function () {
        return endOperation(this);
      },

      refresh: methodOp(function () {
        var oldHeight = this.display.cachedTextHeight;
        regChange(this);
        this.curOp.forceUpdate = true;
        clearCaches(this);
        scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);
        updateGutterSpace(this.display);
        if (
          oldHeight == null ||
          Math.abs(oldHeight - textHeight(this.display)) > 0.5 ||
          this.options.lineWrapping
        ) {
          estimateLineHeights(this);
        }
        signal(this, "refresh", this);
      }),

      swapDoc: methodOp(function (doc) {
        var old = this.doc;
        old.cm = null;
        // Cancel the current text selection if any (#5821)
        if (this.state.selectingText) {
          this.state.selectingText();
        }
        attachDoc(this, doc);
        clearCaches(this);
        this.display.input.reset();
        scrollToCoords(this, doc.scrollLeft, doc.scrollTop);
        this.curOp.forceScroll = true;
        signalLater(this, "swapDoc", this, old);
        return old;
      }),

      phrase: function (phraseText) {
        var phrases = this.options.phrases;
        return phrases &&
          Object.prototype.hasOwnProperty.call(phrases, phraseText)
          ? phrases[phraseText]
          : phraseText;
      },

      getInputField: function () {
        return this.display.input.getField();
      },
      getWrapperElement: function () {
        return this.display.wrapper;
      },
      getScrollerElement: function () {
        return this.display.scroller;
      },
      getGutterElement: function () {
        return this.display.gutters;
      },
    };
    eventMixin(CodeMirror);

    CodeMirror.registerHelper = function (type, name, value) {
      if (!helpers.hasOwnProperty(type)) {
        helpers[type] = CodeMirror[type] = { _global: [] };
      }
      helpers[type][name] = value;
    };
    CodeMirror.registerGlobalHelper = function (type, name, predicate, value) {
      CodeMirror.registerHelper(type, name, value);
      helpers[type]._global.push({ pred: predicate, val: value });
    };
  }

  // Used for horizontal relative motion. Dir is -1 or 1 (left or
  // right), unit can be "codepoint", "char", "column" (like char, but
  // doesn't cross line boundaries), "word" (across next word), or
  // "group" (to the start of next group of word or
  // non-word-non-whitespace chars). The visually param controls
  // whether, in right-to-left text, direction 1 means to move towards
  // the next index in the string, or towards the character to the right
  // of the current position. The resulting position will have a
  // hitSide=true property if it reached the end of the document.
  function findPosH(doc, pos, dir, unit, visually) {
    var oldPos = pos;
    var origDir = dir;
    var lineObj = getLine(doc, pos.line);
    var lineDir = visually && doc.direction == "rtl" ? -dir : dir;
    function findNextLine() {
      var l = pos.line + lineDir;
      if (l < doc.first || l >= doc.first + doc.size) {
        return false;
      }
      pos = new Pos(l, pos.ch, pos.sticky);
      return (lineObj = getLine(doc, l));
    }
    function moveOnce(boundToLine) {
      var next;
      if (unit == "codepoint") {
        var ch = lineObj.text.charCodeAt(pos.ch + (dir > 0 ? 0 : -1));
        if (isNaN(ch)) {
          next = null;
        } else {
          var astral =
            dir > 0 ? ch >= 0xd800 && ch < 0xdc00 : ch >= 0xdc00 && ch < 0xdfff;
          next = new Pos(
            pos.line,
            Math.max(
              0,
              Math.min(lineObj.text.length, pos.ch + dir * (astral ? 2 : 1))
            ),
            -dir
          );
        }
      } else if (visually) {
        next = moveVisually(doc.cm, lineObj, pos, dir);
      } else {
        next = moveLogically(lineObj, pos, dir);
      }
      if (next == null) {
        if (!boundToLine && findNextLine()) {
          pos = endOfLine(visually, doc.cm, lineObj, pos.line, lineDir);
        } else {
          return false;
        }
      } else {
        pos = next;
      }
      return true;
    }

    if (unit == "char" || unit == "codepoint") {
      moveOnce();
    } else if (unit == "column") {
      moveOnce(true);
    } else if (unit == "word" || unit == "group") {
      var sawType = null,
        group = unit == "group";
      var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
      for (var first = true; ; first = false) {
        if (dir < 0 && !moveOnce(!first)) {
          break;
        }
        var cur = lineObj.text.charAt(pos.ch) || "\n";
        var type = isWordChar(cur, helper)
          ? "w"
          : group && cur == "\n"
          ? "n"
          : !group || /\s/.test(cur)
          ? null
          : "p";
        if (group && !first && !type) {
          type = "s";
        }
        if (sawType && sawType != type) {
          if (dir < 0) {
            dir = 1;
            moveOnce();
            pos.sticky = "after";
          }
          break;
        }

        if (type) {
          sawType = type;
        }
        if (dir > 0 && !moveOnce(!first)) {
          break;
        }
      }
    }
    var result = skipAtomic(doc, pos, oldPos, origDir, true);
    if (equalCursorPos(oldPos, result)) {
      result.hitSide = true;
    }
    return result;
  }

  // For relative vertical movement. Dir may be -1 or 1. Unit can be
  // "page" or "line". The resulting position will have a hitSide=true
  // property if it reached the end of the document.
  function findPosV(cm, pos, dir, unit) {
    var doc = cm.doc,
      x = pos.left,
      y;
    if (unit == "page") {
      var pageSize = Math.min(
        cm.display.wrapper.clientHeight,
        window.innerHeight || document.documentElement.clientHeight
      );
      var moveAmount = Math.max(pageSize - 0.5 * textHeight(cm.display), 3);
      y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;
    } else if (unit == "line") {
      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
    }
    var target;
    for (;;) {
      target = coordsChar(cm, x, y);
      if (!target.outside) {
        break;
      }
      if (dir < 0 ? y <= 0 : y >= doc.height) {
        target.hitSide = true;
        break;
      }
      y += dir * 5;
    }
    return target;
  }

  // CONTENTEDITABLE INPUT STYLE

  var ContentEditableInput = function (cm) {
    this.cm = cm;
    this.lastAnchorNode =
      this.lastAnchorOffset =
      this.lastFocusNode =
      this.lastFocusOffset =
        null;
    this.polling = new Delayed();
    this.composing = null;
    this.gracePeriod = false;
    this.readDOMTimeout = null;
  };

  ContentEditableInput.prototype.init = function (display) {
    var this$1 = this;

    var input = this,
      cm = input.cm;
    var div = (input.div = display.lineDiv);
    div.contentEditable = true;
    disableBrowserMagic(
      div,
      cm.options.spellcheck,
      cm.options.autocorrect,
      cm.options.autocapitalize
    );

    function belongsToInput(e) {
      for (var t = e.target; t; t = t.parentNode) {
        if (t == div) {
          return true;
        }
        if (/\bCodeMirror-(?:line)?widget\b/.test(t.className)) {
          break;
        }
      }
      return false;
    }

    on(div, "paste", function (e) {
      if (!belongsToInput(e) || signalDOMEvent(cm, e) || handlePaste(e, cm)) {
        return;
      }
      // IE doesn't fire input events, so we schedule a read for the pasted content in this way
      if (ie_version <= 11) {
        setTimeout(
          operation(cm, function () {
            return this$1.updateFromDOM();
          }),
          20
        );
      }
    });

    on(div, "compositionstart", function (e) {
      this$1.composing = { data: e.data, done: false };
    });
    on(div, "compositionupdate", function (e) {
      if (!this$1.composing) {
        this$1.composing = { data: e.data, done: false };
      }
    });
    on(div, "compositionend", function (e) {
      if (this$1.composing) {
        if (e.data != this$1.composing.data) {
          this$1.readFromDOMSoon();
        }
        this$1.composing.done = true;
      }
    });

    on(div, "touchstart", function () {
      return input.forceCompositionEnd();
    });

    on(div, "input", function () {
      if (!this$1.composing) {
        this$1.readFromDOMSoon();
      }
    });

    function onCopyCut(e) {
      if (!belongsToInput(e) || signalDOMEvent(cm, e)) {
        return;
      }
      if (cm.somethingSelected()) {
        setLastCopied({ lineWise: false, text: cm.getSelections() });
        if (e.type == "cut") {
          cm.replaceSelection("", null, "cut");
        }
      } else if (!cm.options.lineWiseCopyCut) {
        return;
      } else {
        var ranges = copyableRanges(cm);
        setLastCopied({ lineWise: true, text: ranges.text });
        if (e.type == "cut") {
          cm.operation(function () {
            cm.setSelections(ranges.ranges, 0, sel_dontScroll);
            cm.replaceSelection("", null, "cut");
          });
        }
      }
      if (e.clipboardData) {
        e.clipboardData.clearData();
        var content = lastCopied.text.join("\n");
        // iOS exposes the clipboard API, but seems to discard content inserted into it
        e.clipboardData.setData("Text", content);
        if (e.clipboardData.getData("Text") == content) {
          e.preventDefault();
          return;
        }
      }
      // Old-fashioned briefly-focus-a-textarea hack
      var kludge = hiddenTextarea(),
        te = kludge.firstChild;
      cm.display.lineSpace.insertBefore(
        kludge,
        cm.display.lineSpace.firstChild
      );
      te.value = lastCopied.text.join("\n");
      var hadFocus = activeElt();
      selectInput(te);
      setTimeout(function () {
        cm.display.lineSpace.removeChild(kludge);
        hadFocus.focus();
        if (hadFocus == div) {
          input.showPrimarySelection();
        }
      }, 50);
    }
    on(div, "copy", onCopyCut);
    on(div, "cut", onCopyCut);
  };

  ContentEditableInput.prototype.screenReaderLabelChanged = function (label) {
    // Label for screenreaders, accessibility
    if (label) {
      this.div.setAttribute("aria-label", label);
    } else {
      this.div.removeAttribute("aria-label");
    }
  };

  ContentEditableInput.prototype.prepareSelection = function () {
    var result = prepareSelection(this.cm, false);
    result.focus = activeElt() == this.div;
    return result;
  };

  ContentEditableInput.prototype.showSelection = function (info, takeFocus) {
    if (!info || !this.cm.display.view.length) {
      return;
    }
    if (info.focus || takeFocus) {
      this.showPrimarySelection();
    }
    this.showMultipleSelections(info);
  };

  ContentEditableInput.prototype.getSelection = function () {
    return this.cm.display.wrapper.ownerDocument.getSelection();
  };

  ContentEditableInput.prototype.showPrimarySelection = function () {
    var sel = this.getSelection(),
      cm = this.cm,
      prim = cm.doc.sel.primary();
    var from = prim.from(),
      to = prim.to();

    if (
      cm.display.viewTo == cm.display.viewFrom ||
      from.line >= cm.display.viewTo ||
      to.line < cm.display.viewFrom
    ) {
      sel.removeAllRanges();
      return;
    }

    var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
    var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);
    if (
      curAnchor &&
      !curAnchor.bad &&
      curFocus &&
      !curFocus.bad &&
      cmp(minPos(curAnchor, curFocus), from) == 0 &&
      cmp(maxPos(curAnchor, curFocus), to) == 0
    ) {
      return;
    }

    var view = cm.display.view;
    var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) || {
      node: view[0].measure.map[2],
      offset: 0,
    };
    var end = to.line < cm.display.viewTo && posToDOM(cm, to);
    if (!end) {
      var measure = view[view.length - 1].measure;
      var map = measure.maps
        ? measure.maps[measure.maps.length - 1]
        : measure.map;
      end = {
        node: map[map.length - 1],
        offset: map[map.length - 2] - map[map.length - 3],
      };
    }

    if (!start || !end) {
      sel.removeAllRanges();
      return;
    }

    var old = sel.rangeCount && sel.getRangeAt(0),
      rng;
    try {
      rng = range(start.node, start.offset, end.offset, end.node);
    } catch (e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
    if (rng) {
      if (!gecko && cm.state.focused) {
        sel.collapse(start.node, start.offset);
        if (!rng.collapsed) {
          sel.removeAllRanges();
          sel.addRange(rng);
        }
      } else {
        sel.removeAllRanges();
        sel.addRange(rng);
      }
      if (old && sel.anchorNode == null) {
        sel.addRange(old);
      } else if (gecko) {
        this.startGracePeriod();
      }
    }
    this.rememberSelection();
  };

  ContentEditableInput.prototype.startGracePeriod = function () {
    var this$1 = this;

    clearTimeout(this.gracePeriod);
    this.gracePeriod = setTimeout(function () {
      this$1.gracePeriod = false;
      if (this$1.selectionChanged()) {
        this$1.cm.operation(function () {
          return (this$1.cm.curOp.selectionChanged = true);
        });
      }
    }, 20);
  };

  ContentEditableInput.prototype.showMultipleSelections = function (info) {
    removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
    removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
  };

  ContentEditableInput.prototype.rememberSelection = function () {
    var sel = this.getSelection();
    this.lastAnchorNode = sel.anchorNode;
    this.lastAnchorOffset = sel.anchorOffset;
    this.lastFocusNode = sel.focusNode;
    this.lastFocusOffset = sel.focusOffset;
  };

  ContentEditableInput.prototype.selectionInEditor = function () {
    var sel = this.getSelection();
    if (!sel.rangeCount) {
      return false;
    }
    var node = sel.getRangeAt(0).commonAncestorContainer;
    return contains(this.div, node);
  };

  ContentEditableInput.prototype.focus = function () {
    if (this.cm.options.readOnly != "nocursor") {
      if (!this.selectionInEditor() || activeElt() != this.div) {
        this.showSelection(this.prepareSelection(), true);
      }
      this.div.focus();
    }
  };
  ContentEditableInput.prototype.blur = function () {
    this.div.blur();
  };
  ContentEditableInput.prototype.getField = function () {
    return this.div;
  };

  ContentEditableInput.prototype.supportsTouch = function () {
    return true;
  };

  ContentEditableInput.prototype.receivedFocus = function () {
    var input = this;
    if (this.selectionInEditor()) {
      this.pollSelection();
    } else {
      runInOp(this.cm, function () {
        return (input.cm.curOp.selectionChanged = true);
      });
    }

    function poll() {
      if (input.cm.state.focused) {
        input.pollSelection();
        input.polling.set(input.cm.options.pollInterval, poll);
      }
    }
    this.polling.set(this.cm.options.pollInterval, poll);
  };

  ContentEditableInput.prototype.selectionChanged = function () {
    var sel = this.getSelection();
    return (
      sel.anchorNode != this.lastAnchorNode ||
      sel.anchorOffset != this.lastAnchorOffset ||
      sel.focusNode != this.lastFocusNode ||
      sel.focusOffset != this.lastFocusOffset
    );
  };

  ContentEditableInput.prototype.pollSelection = function () {
    if (
      this.readDOMTimeout != null ||
      this.gracePeriod ||
      !this.selectionChanged()
    ) {
      return;
    }
    var sel = this.getSelection(),
      cm = this.cm;
    // On Android Chrome (version 56, at least), backspacing into an
    // uneditable block element will put the cursor in that element,
    // and then, because it's not editable, hide the virtual keyboard.
    // Because Android doesn't allow us to actually detect backspace
    // presses in a sane way, this code checks for when that happens
    // and simulates a backspace press in this case.
    if (
      android &&
      chrome &&
      this.cm.display.gutterSpecs.length &&
      isInGutter(sel.anchorNode)
    ) {
      this.cm.triggerOnKeyDown({
        type: "keydown",
        keyCode: 8,
        preventDefault: Math.abs,
      });
      this.blur();
      this.focus();
      return;
    }
    if (this.composing) {
      return;
    }
    this.rememberSelection();
    var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
    var head = domToPos(cm, sel.focusNode, sel.focusOffset);
    if (anchor && head) {
      runInOp(cm, function () {
        setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
        if (anchor.bad || head.bad) {
          cm.curOp.selectionChanged = true;
        }
      });
    }
  };

  ContentEditableInput.prototype.pollContent = function () {
    if (this.readDOMTimeout != null) {
      clearTimeout(this.readDOMTimeout);
      this.readDOMTimeout = null;
    }

    var cm = this.cm,
      display = cm.display,
      sel = cm.doc.sel.primary();
    var from = sel.from(),
      to = sel.to();
    if (from.ch == 0 && from.line > cm.firstLine()) {
      from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length);
    }
    if (
      to.ch == getLine(cm.doc, to.line).text.length &&
      to.line < cm.lastLine()
    ) {
      to = Pos(to.line + 1, 0);
    }
    if (from.line < display.viewFrom || to.line > display.viewTo - 1) {
      return false;
    }

    var fromIndex, fromLine, fromNode;
    if (
      from.line == display.viewFrom ||
      (fromIndex = findViewIndex(cm, from.line)) == 0
    ) {
      fromLine = lineNo(display.view[0].line);
      fromNode = display.view[0].node;
    } else {
      fromLine = lineNo(display.view[fromIndex].line);
      fromNode = display.view[fromIndex - 1].node.nextSibling;
    }
    var toIndex = findViewIndex(cm, to.line);
    var toLine, toNode;
    if (toIndex == display.view.length - 1) {
      toLine = display.viewTo - 1;
      toNode = display.lineDiv.lastChild;
    } else {
      toLine = lineNo(display.view[toIndex + 1].line) - 1;
      toNode = display.view[toIndex + 1].node.previousSibling;
    }

    if (!fromNode) {
      return false;
    }
    var newText = cm.doc.splitLines(
      domTextBetween(cm, fromNode, toNode, fromLine, toLine)
    );
    var oldText = getBetween(
      cm.doc,
      Pos(fromLine, 0),
      Pos(toLine, getLine(cm.doc, toLine).text.length)
    );
    while (newText.length > 1 && oldText.length > 1) {
      if (lst(newText) == lst(oldText)) {
        newText.pop();
        oldText.pop();
        toLine--;
      } else if (newText[0] == oldText[0]) {
        newText.shift();
        oldText.shift();
        fromLine++;
      } else {
        break;
      }
    }

    var cutFront = 0,
      cutEnd = 0;
    var newTop = newText[0],
      oldTop = oldText[0],
      maxCutFront = Math.min(newTop.length, oldTop.length);
    while (
      cutFront < maxCutFront &&
      newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront)
    ) {
      ++cutFront;
    }
    var newBot = lst(newText),
      oldBot = lst(oldText);
    var maxCutEnd = Math.min(
      newBot.length - (newText.length == 1 ? cutFront : 0),
      oldBot.length - (oldText.length == 1 ? cutFront : 0)
    );
    while (
      cutEnd < maxCutEnd &&
      newBot.charCodeAt(newBot.length - cutEnd - 1) ==
        oldBot.charCodeAt(oldBot.length - cutEnd - 1)
    ) {
      ++cutEnd;
    }
    // Try to move start of change to start of selection if ambiguous
    if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
      while (
        cutFront &&
        cutFront > from.ch &&
        newBot.charCodeAt(newBot.length - cutEnd - 1) ==
          oldBot.charCodeAt(oldBot.length - cutEnd - 1)
      ) {
        cutFront--;
        cutEnd++;
      }
    }

    newText[newText.length - 1] = newBot
      .slice(0, newBot.length - cutEnd)
      .replace(/^\u200b+/, "");
    newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "");

    var chFrom = Pos(fromLine, cutFront);
    var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
    if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
      replaceRange(cm.doc, newText, chFrom, chTo, "+input");
      return true;
    }
  };

  ContentEditableInput.prototype.ensurePolled = function () {
    this.forceCompositionEnd();
  };
  ContentEditableInput.prototype.reset = function () {
    this.forceCompositionEnd();
  };
  ContentEditableInput.prototype.forceCompositionEnd = function () {
    if (!this.composing) {
      return;
    }
    clearTimeout(this.readDOMTimeout);
    this.composing = null;
    this.updateFromDOM();
    this.div.blur();
    this.div.focus();
  };
  ContentEditableInput.prototype.readFromDOMSoon = function () {
    var this$1 = this;

    if (this.readDOMTimeout != null) {
      return;
    }
    this.readDOMTimeout = setTimeout(function () {
      this$1.readDOMTimeout = null;
      if (this$1.composing) {
        if (this$1.composing.done) {
          this$1.composing = null;
        } else {
          return;
        }
      }
      this$1.updateFromDOM();
    }, 80);
  };

  ContentEditableInput.prototype.updateFromDOM = function () {
    var this$1 = this;

    if (this.cm.isReadOnly() || !this.pollContent()) {
      runInOp(this.cm, function () {
        return regChange(this$1.cm);
      });
    }
  };

  ContentEditableInput.prototype.setUneditable = function (node) {
    node.contentEditable = "false";
  };

  ContentEditableInput.prototype.onKeyPress = function (e) {
    if (e.charCode == 0 || this.composing) {
      return;
    }
    e.preventDefault();
    if (!this.cm.isReadOnly()) {
      operation(this.cm, applyTextInput)(
        this.cm,
        String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode),
        0
      );
    }
  };

  ContentEditableInput.prototype.readOnlyChanged = function (val) {
    this.div.contentEditable = String(val != "nocursor");
  };

  ContentEditableInput.prototype.onContextMenu = function () {};
  ContentEditableInput.prototype.resetPosition = function () {};

  ContentEditableInput.prototype.needsContentAttribute = true;

  function posToDOM(cm, pos) {
    var view = findViewForLine(cm, pos.line);
    if (!view || view.hidden) {
      return null;
    }
    var line = getLine(cm.doc, pos.line);
    var info = mapFromLineView(view, line, pos.line);

    var order = getOrder(line, cm.doc.direction),
      side = "left";
    if (order) {
      var partPos = getBidiPartAt(order, pos.ch);
      side = partPos % 2 ? "right" : "left";
    }
    var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
    result.offset = result.collapse == "right" ? result.end : result.start;
    return result;
  }

  function isInGutter(node) {
    for (var scan = node; scan; scan = scan.parentNode) {
      if (/CodeMirror-gutter-wrapper/.test(scan.className)) {
        return true;
      }
    }
    return false;
  }

  function badPos(pos, bad) {
    if (bad) {
      pos.bad = true;
    }
    return pos;
  }

  function domTextBetween(cm, from, to, fromLine, toLine) {
    var text = "",
      closing = false,
      lineSep = cm.doc.lineSeparator(),
      extraLinebreak = false;
    function recognizeMarker(id) {
      return function (marker) {
        return marker.id == id;
      };
    }
    function close() {
      if (closing) {
        text += lineSep;
        if (extraLinebreak) {
          text += lineSep;
        }
        closing = extraLinebreak = false;
      }
    }
    function addText(str) {
      if (str) {
        close();
        text += str;
      }
    }
    function walk(node) {
      if (node.nodeType == 1) {
        var cmText = node.getAttribute("cm-text");
        if (cmText) {
          addText(cmText);
          return;
        }
        var markerID = node.getAttribute("cm-marker"),
          range;
        if (markerID) {
          var found = cm.findMarks(
            Pos(fromLine, 0),
            Pos(toLine + 1, 0),
            recognizeMarker(+markerID)
          );
          if (found.length && (range = found[0].find(0))) {
            addText(getBetween(cm.doc, range.from, range.to).join(lineSep));
          }
          return;
        }
        if (node.getAttribute("contenteditable") == "false") {
          return;
        }
        var isBlock = /^(pre|div|p|li|table|br)$/i.test(node.nodeName);
        if (!/^br$/i.test(node.nodeName) && node.textContent.length == 0) {
          return;
        }

        if (isBlock) {
          close();
        }
        for (var i = 0; i < node.childNodes.length; i++) {
          walk(node.childNodes[i]);
        }

        if (/^(pre|p)$/i.test(node.nodeName)) {
          extraLinebreak = true;
        }
        if (isBlock) {
          closing = true;
        }
      } else if (node.nodeType == 3) {
        addText(node.nodeValue.replace(/\u200b/g, "").replace(/\u00a0/g, " "));
      }
    }
    for (;;) {
      walk(from);
      if (from == to) {
        break;
      }
      from = from.nextSibling;
      extraLinebreak = false;
    }
    return text;
  }

  function domToPos(cm, node, offset) {
    var lineNode;
    if (node == cm.display.lineDiv) {
      lineNode = cm.display.lineDiv.childNodes[offset];
      if (!lineNode) {
        return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true);
      }
      node = null;
      offset = 0;
    } else {
      for (lineNode = node; ; lineNode = lineNode.parentNode) {
        if (!lineNode || lineNode == cm.display.lineDiv) {
          return null;
        }
        if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) {
          break;
        }
      }
    }
    for (var i = 0; i < cm.display.view.length; i++) {
      var lineView = cm.display.view[i];
      if (lineView.node == lineNode) {
        return locateNodeInLineView(lineView, node, offset);
      }
    }
  }

  function locateNodeInLineView(lineView, node, offset) {
    var wrapper = lineView.text.firstChild,
      bad = false;
    if (!node || !contains(wrapper, node)) {
      return badPos(Pos(lineNo(lineView.line), 0), true);
    }
    if (node == wrapper) {
      bad = true;
      node = wrapper.childNodes[offset];
      offset = 0;
      if (!node) {
        var line = lineView.rest ? lst(lineView.rest) : lineView.line;
        return badPos(Pos(lineNo(line), line.text.length), bad);
      }
    }

    var textNode = node.nodeType == 3 ? node : null,
      topNode = node;
    if (
      !textNode &&
      node.childNodes.length == 1 &&
      node.firstChild.nodeType == 3
    ) {
      textNode = node.firstChild;
      if (offset) {
        offset = textNode.nodeValue.length;
      }
    }
    while (topNode.parentNode != wrapper) {
      topNode = topNode.parentNode;
    }
    var measure = lineView.measure,
      maps = measure.maps;

    function find(textNode, topNode, offset) {
      for (var i = -1; i < (maps ? maps.length : 0); i++) {
        var map = i < 0 ? measure.map : maps[i];
        for (var j = 0; j < map.length; j += 3) {
          var curNode = map[j + 2];
          if (curNode == textNode || curNode == topNode) {
            var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
            var ch = map[j] + offset;
            if (offset < 0 || curNode != textNode) {
              ch = map[j + (offset ? 1 : 0)];
            }
            return Pos(line, ch);
          }
        }
      }
    }
    var found = find(textNode, topNode, offset);
    if (found) {
      return badPos(found, bad);
    }

    // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
    for (
      var after = topNode.nextSibling,
        dist = textNode ? textNode.nodeValue.length - offset : 0;
      after;
      after = after.nextSibling
    ) {
      found = find(after, after.firstChild, 0);
      if (found) {
        return badPos(Pos(found.line, found.ch - dist), bad);
      } else {
        dist += after.textContent.length;
      }
    }
    for (
      var before = topNode.previousSibling, dist$1 = offset;
      before;
      before = before.previousSibling
    ) {
      found = find(before, before.firstChild, -1);
      if (found) {
        return badPos(Pos(found.line, found.ch + dist$1), bad);
      } else {
        dist$1 += before.textContent.length;
      }
    }
  }

  // TEXTAREA INPUT STYLE

  var TextareaInput = function (cm) {
    this.cm = cm;
    // See input.poll and input.reset
    this.prevInput = "";

    // Flag that indicates whether we expect input to appear real soon
    // now (after some event like 'keypress' or 'input') and are
    // polling intensively.
    this.pollingFast = false;
    // Self-resetting timeout for the poller
    this.polling = new Delayed();
    // Used to work around IE issue with selection being forgotten when focus moves away from textarea
    this.hasSelection = false;
    this.composing = null;
  };

  TextareaInput.prototype.init = function (display) {
    var this$1 = this;

    var input = this,
      cm = this.cm;
    this.createField(display);
    var te = this.textarea;

    display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild);

    // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
    if (ios) {
      te.style.width = "0px";
    }

    on(te, "input", function () {
      if (ie && ie_version >= 9 && this$1.hasSelection) {
        this$1.hasSelection = null;
      }
      input.poll();
    });

    on(te, "paste", function (e) {
      if (signalDOMEvent(cm, e) || handlePaste(e, cm)) {
        return;
      }

      cm.state.pasteIncoming = +new Date();
      input.fastPoll();
    });

    function prepareCopyCut(e) {
      if (signalDOMEvent(cm, e)) {
        return;
      }
      if (cm.somethingSelected()) {
        setLastCopied({ lineWise: false, text: cm.getSelections() });
      } else if (!cm.options.lineWiseCopyCut) {
        return;
      } else {
        var ranges = copyableRanges(cm);
        setLastCopied({ lineWise: true, text: ranges.text });
        if (e.type == "cut") {
          cm.setSelections(ranges.ranges, null, sel_dontScroll);
        } else {
          input.prevInput = "";
          te.value = ranges.text.join("\n");
          selectInput(te);
        }
      }
      if (e.type == "cut") {
        cm.state.cutIncoming = +new Date();
      }
    }
    on(te, "cut", prepareCopyCut);
    on(te, "copy", prepareCopyCut);

    on(display.scroller, "paste", function (e) {
      if (eventInWidget(display, e) || signalDOMEvent(cm, e)) {
        return;
      }
      if (!te.dispatchEvent) {
        cm.state.pasteIncoming = +new Date();
        input.focus();
        return;
      }

      // Pass the `paste` event to the textarea so it's handled by its event listener.
      var event = new Event("paste");
      event.clipboardData = e.clipboardData;
      te.dispatchEvent(event);
    });

    // Prevent normal selection in the editor (we handle our own)
    on(display.lineSpace, "selectstart", function (e) {
      if (!eventInWidget(display, e)) {
        e_preventDefault(e);
      }
    });

    on(te, "compositionstart", function () {
      var start = cm.getCursor("from");
      if (input.composing) {
        input.composing.range.clear();
      }
      input.composing = {
        start: start,
        range: cm.markText(start, cm.getCursor("to"), {
          className: "CodeMirror-composing",
        }),
      };
    });
    on(te, "compositionend", function () {
      if (input.composing) {
        input.poll();
        input.composing.range.clear();
        input.composing = null;
      }
    });
  };

  TextareaInput.prototype.createField = function (_display) {
    // Wraps and hides input textarea
    this.wrapper = hiddenTextarea();
    // The semihidden textarea that is focused when the editor is
    // focused, and receives input.
    this.textarea = this.wrapper.firstChild;
  };

  TextareaInput.prototype.screenReaderLabelChanged = function (label) {
    // Label for screenreaders, accessibility
    if (label) {
      this.textarea.setAttribute("aria-label", label);
    } else {
      this.textarea.removeAttribute("aria-label");
    }
  };

  TextareaInput.prototype.prepareSelection = function () {
    // Redraw the selection and/or cursor
    var cm = this.cm,
      display = cm.display,
      doc = cm.doc;
    var result = prepareSelection(cm);

    // Move the hidden textarea near the cursor to prevent scrolling artifacts
    if (cm.options.moveInputWithCursor) {
      var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
      var wrapOff = display.wrapper.getBoundingClientRect(),
        lineOff = display.lineDiv.getBoundingClientRect();
      result.teTop = Math.max(
        0,
        Math.min(
          display.wrapper.clientHeight - 10,
          headPos.top + lineOff.top - wrapOff.top
        )
      );
      result.teLeft = Math.max(
        0,
        Math.min(
          display.wrapper.clientWidth - 10,
          headPos.left + lineOff.left - wrapOff.left
        )
      );
    }

    return result;
  };

  TextareaInput.prototype.showSelection = function (drawn) {
    var cm = this.cm,
      display = cm.display;
    removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
    removeChildrenAndAdd(display.selectionDiv, drawn.selection);
    if (drawn.teTop != null) {
      this.wrapper.style.top = drawn.teTop + "px";
      this.wrapper.style.left = drawn.teLeft + "px";
    }
  };

  // Reset the input to correspond to the selection (or to be empty,
  // when not typing and nothing is selected)
  TextareaInput.prototype.reset = function (typing) {
    if (this.contextMenuPending || this.composing) {
      return;
    }
    var cm = this.cm;
    if (cm.somethingSelected()) {
      this.prevInput = "";
      var content = cm.getSelection();
      this.textarea.value = content;
      if (cm.state.focused) {
        selectInput(this.textarea);
      }
      if (ie && ie_version >= 9) {
        this.hasSelection = content;
      }
    } else if (!typing) {
      this.prevInput = this.textarea.value = "";
      if (ie && ie_version >= 9) {
        this.hasSelection = null;
      }
    }
  };

  TextareaInput.prototype.getField = function () {
    return this.textarea;
  };

  TextareaInput.prototype.supportsTouch = function () {
    return false;
  };

  TextareaInput.prototype.focus = function () {
    if (
      this.cm.options.readOnly != "nocursor" &&
      (!mobile || activeElt() != this.textarea)
    ) {
      try {
        this.textarea.focus();
      } catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
    }
  };

  TextareaInput.prototype.blur = function () {
    this.textarea.blur();
  };

  TextareaInput.prototype.resetPosition = function () {
    this.wrapper.style.top = this.wrapper.style.left = 0;
  };

  TextareaInput.prototype.receivedFocus = function () {
    this.slowPoll();
  };

  // Poll for input changes, using the normal rate of polling. This
  // runs as long as the editor is focused.
  TextareaInput.prototype.slowPoll = function () {
    var this$1 = this;

    if (this.pollingFast) {
      return;
    }
    this.polling.set(this.cm.options.pollInterval, function () {
      this$1.poll();
      if (this$1.cm.state.focused) {
        this$1.slowPoll();
      }
    });
  };

  // When an event has just come in that is likely to add or change
  // something in the input textarea, we poll faster, to ensure that
  // the change appears on the screen quickly.
  TextareaInput.prototype.fastPoll = function () {
    var missed = false,
      input = this;
    input.pollingFast = true;
    function p() {
      var changed = input.poll();
      if (!changed && !missed) {
        missed = true;
        input.polling.set(60, p);
      } else {
        input.pollingFast = false;
        input.slowPoll();
      }
    }
    input.polling.set(20, p);
  };

  // Read input from the textarea, and update the document to match.
  // When something is selected, it is present in the textarea, and
  // selected (unless it is huge, in which case a placeholder is
  // used). When nothing is selected, the cursor sits after previously
  // seen text (can be empty), which is stored in prevInput (we must
  // not reset the textarea when typing, because that breaks IME).
  TextareaInput.prototype.poll = function () {
    var this$1 = this;

    var cm = this.cm,
      input = this.textarea,
      prevInput = this.prevInput;
    // Since this is called a *lot*, try to bail out as cheaply as
    // possible when it is clear that nothing happened. hasSelection
    // will be the case when there is a lot of text in the textarea,
    // in which case reading its value would be expensive.
    if (
      this.contextMenuPending ||
      !cm.state.focused ||
      (hasSelection(input) && !prevInput && !this.composing) ||
      cm.isReadOnly() ||
      cm.options.disableInput ||
      cm.state.keySeq
    ) {
      return false;
    }

    var text = input.value;
    // If nothing changed, bail.
    if (text == prevInput && !cm.somethingSelected()) {
      return false;
    }
    // Work around nonsensical selection resetting in IE9/10, and
    // inexplicable appearance of private area unicode characters on
    // some key combos in Mac (#2689).
    if (
      (ie && ie_version >= 9 && this.hasSelection === text) ||
      (mac && /[\uf700-\uf7ff]/.test(text))
    ) {
      cm.display.input.reset();
      return false;
    }

    if (cm.doc.sel == cm.display.selForContextMenu) {
      var first = text.charCodeAt(0);
      if (first == 0x200b && !prevInput) {
        prevInput = "\u200b";
      }
      if (first == 0x21da) {
        this.reset();
        return this.cm.execCommand("undo");
      }
    }
    // Find the part of the input that is actually new
    var same = 0,
      l = Math.min(prevInput.length, text.length);
    while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) {
      ++same;
    }

    runInOp(cm, function () {
      applyTextInput(
        cm,
        text.slice(same),
        prevInput.length - same,
        null,
        this$1.composing ? "*compose" : null
      );

      // Don't leave long text in the textarea, since it makes further polling slow
      if (text.length > 1000 || text.indexOf("\n") > -1) {
        input.value = this$1.prevInput = "";
      } else {
        this$1.prevInput = text;
      }

      if (this$1.composing) {
        this$1.composing.range.clear();
        this$1.composing.range = cm.markText(
          this$1.composing.start,
          cm.getCursor("to"),
          { className: "CodeMirror-composing" }
        );
      }
    });
    return true;
  };

  TextareaInput.prototype.ensurePolled = function () {
    if (this.pollingFast && this.poll()) {
      this.pollingFast = false;
    }
  };

  TextareaInput.prototype.onKeyPress = function () {
    if (ie && ie_version >= 9) {
      this.hasSelection = null;
    }
    this.fastPoll();
  };

  TextareaInput.prototype.onContextMenu = function (e) {
    var input = this,
      cm = input.cm,
      display = cm.display,
      te = input.textarea;
    if (input.contextMenuPending) {
      input.contextMenuPending();
    }
    var pos = posFromMouse(cm, e),
      scrollPos = display.scroller.scrollTop;
    if (!pos || presto) {
      return;
    } // Opera is difficult.

    // Reset the current text selection only if the click is done outside of the selection
    // and 'resetSelectionOnContextMenu' option is true.
    var reset = cm.options.resetSelectionOnContextMenu;
    if (reset && cm.doc.sel.contains(pos) == -1) {
      operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
    }

    var oldCSS = te.style.cssText,
      oldWrapperCSS = input.wrapper.style.cssText;
    var wrapperBox = input.wrapper.offsetParent.getBoundingClientRect();
    input.wrapper.style.cssText = "position: static";
    te.style.cssText =
      "position: absolute; width: 30px; height: 30px;\n      top: " +
      (e.clientY - wrapperBox.top - 5) +
      "px; left: " +
      (e.clientX - wrapperBox.left - 5) +
      "px;\n      z-index: 1000; background: " +
      (ie ? "rgba(255, 255, 255, .05)" : "transparent") +
      ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
    var oldScrollY;
    if (webkit) {
      oldScrollY = window.scrollY;
    } // Work around Chrome issue (#2712)
    display.input.focus();
    if (webkit) {
      window.scrollTo(null, oldScrollY);
    }
    display.input.reset();
    // Adds "Select all" to context menu in FF
    if (!cm.somethingSelected()) {
      te.value = input.prevInput = " ";
    }
    input.contextMenuPending = rehide;
    display.selForContextMenu = cm.doc.sel;
    clearTimeout(display.detectingSelectAll);

    // Select-all will be greyed out if there's nothing to select, so
    // this adds a zero-width space so that we can later check whether
    // it got selected.
    function prepareSelectAllHack() {
      if (te.selectionStart != null) {
        var selected = cm.somethingSelected();
        var extval = "\u200b" + (selected ? te.value : "");
        te.value = "\u21da"; // Used to catch context-menu undo
        te.value = extval;
        input.prevInput = selected ? "" : "\u200b";
        te.selectionStart = 1;
        te.selectionEnd = extval.length;
        // Re-set this, in case some other handler touched the
        // selection in the meantime.
        display.selForContextMenu = cm.doc.sel;
      }
    }
    function rehide() {
      if (input.contextMenuPending != rehide) {
        return;
      }
      input.contextMenuPending = false;
      input.wrapper.style.cssText = oldWrapperCSS;
      te.style.cssText = oldCSS;
      if (ie && ie_version < 9) {
        display.scrollbars.setScrollTop(
          (display.scroller.scrollTop = scrollPos)
        );
      }

      // Try to detect the user choosing select-all
      if (te.selectionStart != null) {
        if (!ie || (ie && ie_version < 9)) {
          prepareSelectAllHack();
        }
        var i = 0,
          poll = function () {
            if (
              display.selForContextMenu == cm.doc.sel &&
              te.selectionStart == 0 &&
              te.selectionEnd > 0 &&
              input.prevInput == "\u200b"
            ) {
              operation(cm, selectAll)(cm);
            } else if (i++ < 10) {
              display.detectingSelectAll = setTimeout(poll, 500);
            } else {
              display.selForContextMenu = null;
              display.input.reset();
            }
          };
        display.detectingSelectAll = setTimeout(poll, 200);
      }
    }

    if (ie && ie_version >= 9) {
      prepareSelectAllHack();
    }
    if (captureRightClick) {
      e_stop(e);
      var mouseup = function () {
        off(window, "mouseup", mouseup);
        setTimeout(rehide, 20);
      };
      on(window, "mouseup", mouseup);
    } else {
      setTimeout(rehide, 50);
    }
  };

  TextareaInput.prototype.readOnlyChanged = function (val) {
    if (!val) {
      this.reset();
    }
    this.textarea.disabled = val == "nocursor";
    this.textarea.readOnly = !!val;
  };

  TextareaInput.prototype.setUneditable = function () {};

  TextareaInput.prototype.needsContentAttribute = false;

  function fromTextArea(textarea, options) {
    options = options ? copyObj(options) : {};
    options.value = textarea.value;
    if (!options.tabindex && textarea.tabIndex) {
      options.tabindex = textarea.tabIndex;
    }
    if (!options.placeholder && textarea.placeholder) {
      options.placeholder = textarea.placeholder;
    }
    // Set autofocus to true if this textarea is focused, or if it has
    // autofocus and no other element is focused.
    if (options.autofocus == null) {
      var hasFocus = activeElt();
      options.autofocus =
        hasFocus == textarea ||
        (textarea.getAttribute("autofocus") != null &&
          hasFocus == document.body);
    }

    function save() {
      textarea.value = cm.getValue();
    }

    var realSubmit;
    if (textarea.form) {
      on(textarea.form, "submit", save);
      // Deplorable hack to make the submit method do the right thing.
      if (!options.leaveSubmitMethodAlone) {
        var form = textarea.form;
        realSubmit = form.submit;
        try {
          var wrappedSubmit = (form.submit = function () {
            save();
            form.submit = realSubmit;
            form.submit();
            form.submit = wrappedSubmit;
          });
        } catch (e) {}
      }
    }

    options.finishInit = function (cm) {
      cm.save = save;
      cm.getTextArea = function () {
        return textarea;
      };
      cm.toTextArea = function () {
        cm.toTextArea = isNaN; // Prevent this from being ran twice
        save();
        textarea.parentNode.removeChild(cm.getWrapperElement());
        textarea.style.display = "";
        if (textarea.form) {
          off(textarea.form, "submit", save);
          if (
            !options.leaveSubmitMethodAlone &&
            typeof textarea.form.submit == "function"
          ) {
            textarea.form.submit = realSubmit;
          }
        }
      };
    };

    textarea.style.display = "none";
    var cm = CodeMirror(function (node) {
      return textarea.parentNode.insertBefore(node, textarea.nextSibling);
    }, options);
    return cm;
  }

  function addLegacyProps(CodeMirror) {
    CodeMirror.off = off;
    CodeMirror.on = on;
    CodeMirror.wheelEventPixels = wheelEventPixels;
    CodeMirror.Doc = Doc;
    CodeMirror.splitLines = splitLinesAuto;
    CodeMirror.countColumn = countColumn;
    CodeMirror.findColumn = findColumn;
    CodeMirror.isWordChar = isWordCharBasic;
    CodeMirror.Pass = Pass;
    CodeMirror.signal = signal;
    CodeMirror.Line = Line;
    CodeMirror.changeEnd = changeEnd;
    CodeMirror.scrollbarModel = scrollbarModel;
    CodeMirror.Pos = Pos;
    CodeMirror.cmpPos = cmp;
    CodeMirror.modes = modes;
    CodeMirror.mimeModes = mimeModes;
    CodeMirror.resolveMode = resolveMode;
    CodeMirror.getMode = getMode;
    CodeMirror.modeExtensions = modeExtensions;
    CodeMirror.extendMode = extendMode;
    CodeMirror.copyState = copyState;
    CodeMirror.startState = startState;
    CodeMirror.innerMode = innerMode;
    CodeMirror.commands = commands;
    CodeMirror.keyMap = keyMap;
    CodeMirror.keyName = keyName;
    CodeMirror.isModifierKey = isModifierKey;
    CodeMirror.lookupKey = lookupKey;
    CodeMirror.normalizeKeyMap = normalizeKeyMap;
    CodeMirror.StringStream = StringStream;
    CodeMirror.SharedTextMarker = SharedTextMarker;
    CodeMirror.TextMarker = TextMarker;
    CodeMirror.LineWidget = LineWidget;
    CodeMirror.e_preventDefault = e_preventDefault;
    CodeMirror.e_stopPropagation = e_stopPropagation;
    CodeMirror.e_stop = e_stop;
    CodeMirror.addClass = addClass;
    CodeMirror.contains = contains;
    CodeMirror.rmClass = rmClass;
    CodeMirror.keyNames = keyNames;
  }

  // EDITOR CONSTRUCTOR

  defineOptions(CodeMirror);

  addEditorMethods(CodeMirror);

  // Set up methods on CodeMirror's prototype to redirect to the editor's document.
  var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
  for (var prop in Doc.prototype) {
    if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0) {
      CodeMirror.prototype[prop] = (function (method) {
        return function () {
          return method.apply(this.doc, arguments);
        };
      })(Doc.prototype[prop]);
    }
  }

  eventMixin(Doc);
  CodeMirror.inputStyles = {
    textarea: TextareaInput,
    contenteditable: ContentEditableInput,
  };

  // Extra arguments are stored as the mode's dependencies, which is
  // used by (legacy) mechanisms like loadmode.js to automatically
  // load a mode. (Preferred mechanism is the require/define calls.)
  CodeMirror.defineMode = function (name /*, mode, â€¦*/) {
    if (!CodeMirror.defaults.mode && name != "null") {
      CodeMirror.defaults.mode = name;
    }
    defineMode.apply(this, arguments);
  };

  CodeMirror.defineMIME = defineMIME;

  // Minimal default mode.
  CodeMirror.defineMode("null", function () {
    return {
      token: function (stream) {
        return stream.skipToEnd();
      },
    };
  });
  CodeMirror.defineMIME("text/plain", "null");

  // EXTENSIONS

  CodeMirror.defineExtension = function (name, func) {
    CodeMirror.prototype[name] = func;
  };
  CodeMirror.defineDocExtension = function (name, func) {
    Doc.prototype[name] = func;
  };

  CodeMirror.fromTextArea = fromTextArea;

  addLegacyProps(CodeMirror);

  CodeMirror.version = "5.62.3";

  return CodeMirror;
});
